Sucker dynamic seal ring seal device to fill the gaps

Recently, the victory of oil mining machine developed by the School of the design of a dynamic seal ring seal rod is successfully obtained national patents. Reportedly, the dynamic seal ring seal can be achieved when the job well with pressure 19-70 mm diameter rod string from under the plastic seal, to fill a gap.
For quick turn after fracturing in the oil field and oil well pumping operations, such as the implementation process with pressure, because no rod tube wellhead annulus seal control device, causing the pump and the pressure at the wellhead poles circumstances not directly from the case victory developed oilfield hospital can achieve different diameter poles dynamic and static sealing rod dynamic seal ring closure device.
Reportedly, the dynamic sealing device from the shell, spherical plastic core, pistons, piston gland, the gland and other components, the use of spherical plastic core piston compression deformation hold poles, hydraulic powered, and by controlling the hydraulic pressure to the size of achieve different diameter poles Security seals and dynamic sealing capacity of 3 MPa, static sealing capacity of 7 MPa.

The two forms of the gear pump seal

Gear pumps are relying on the pump cylinder and the ring gear is formed between the working volume change and move to transport the pressurized fluid or the rotary pump. The two gears, pump and front and rear cover consists of two closed space, when the gear rotates, the gear disengagement-side small volume of the space becomes large, a vacuum, the liquid suction, the gear meshing side volume of the space from the drastic change small, and the liquid pipe to squeeze. Suction chamber and the discharge chamber is by two gears meshing lines separated. Gear pump discharge pressure at the outlet of the pump source resistance full size.
Gear shaft end seal design in two forms, one a mechanical security seals, and the other one is packing pull tight security seals, according to the specific use conditions and user requirements. Ninety one gear of an internationally advanced level of new technology - dual arc sine curve tooth arcs. It is compared with involute gear, the most prominent advantage is the process of meshing tooth profile surface without sliding, so no tooth wear, running balance, phenomenon of trapped liquid, low noise, long life and high efficiency. The pump is designed to get rid of the shackles of tradition, making the gear pump in the design, production and use into a new area.
Pump with pressure relief valve as overload protection, total reflux pressure relief valve discharge pressure of 1.5 times the rated pump. Also allow the discharge pressure range to be adjusted according to actual needs. But this can not be the safety valve valve long-term work, when necessary, be installed in the pipeline.

Discussion from the gas tightness of valves, valve selection

Valves are gas transmission and distribution , storage systems, safe operation and maintenance , renovation, development indispensable equipment . If the gas valve selection of inappropriate or poor quality , it may lead to leaks , stop and other accidents. When an accident occurs , ranging from affecting normal social life, production , heavy to the state, bringing heavy losses of life and property . Therefore, the gas valve must be carefully chosen .
At present China's natural gas industry to use gas valve from the structural form of three main categories, namely, gate valve, ball valve, butterfly valve and so on. The following aspects of the valve from sealing analysis and comparison :
As technology continues to improve , the safety of a variety of valve has also been improved. Parallel Gate Valve stem installed inside protective sleeve , so that stem from erosion of media ; shell using a specially designed " rib cage frame " , reducing the overall weight of the valve , enhanced strength and stiffness of the housing ; resilient elastic sealing valve seal , valve fully open or fully closed , sealing the valve cavity completely isolated from the same media to make the gate with a fire-resistant , high temperature resistance , corrosion resistance characteristics. Valve open and close with a fully enclosed indicator , so that the operator a clear understanding of the state in which the valve .
Ball also has a fire resistance, high temperature characteristics . Fire burned hot seat PTFE sealing material, metal seal seat and the various sealing parts can form a metal -to-metal seal structure, prevents gas diffusion media , to prevent the disaster continues to expand ; it also has anti-static structure, so that valve opening and closing process formed electrostatic into underground , to avoid accumulation of static electricity ignited the media , to ensure safety of equipment ; ball finite bit locking mechanism prevents the operator from misuse or illegal operations.
Vice isolation valve seal width is too narrow , likely to cause the valve flap closure process too far or not in place , the impact seal ; addition, since the sealing of - part of the rubber or PTFE, is easy on the gas erosion damage or loss , and fire when the temperature easily damaged, life is short.
Due to space constraints , the buried gas pipeline can only use butterfly valves. Election should be used more eccentric butterfly valve quality , sealed Teflon or hard high security seal material selection , testing must be accurately adjusted to the closed position.
Valves and ball valves from the structural characteristics and safety are more suitable for underground gas pipeline . But they also have their disadvantages. Ball from design to manufacturing needs a high level of technology , so its higher cost. When you need to rotate the valve opening and closing a lot of laps , opening and closing with a longer time . So we should be integrated in the selection of valves of various factors in ensuring the safe and reliable as far as cost savings , from this perspective, we should be based on the use of the gas pipeline pressure characteristics and rational use of valves, pipeline meets safe operation but also to reduce the cost and make the best use purposes.

Rubber sealing profile design

State aviation special rubber sealing profiles most advanced enterprise has successfully promoted the application of CAD / CATIA and other design software .
New designed sealing profiles more attention to functional requirements , from the previous sponge rubber sealing profiles , solid rubber sealing profiles to the composite rubber seal change , involving a variety of rubber composite sealing profiles, metal frame with a variety of rubber and rubber and composite sealing profiles plastic composite sealing profiles. In some of the newer models design, or even a variable cross-section structure of composite rubber sealing profiles , functional composite rubber sealing profiles new structure.
By PROE / CATIA , etc. The introduction of product design parameters can be entered directly into the CNC machining center for mold design and machining profiles .
Molding profiles
Airlines with special rubber sealing profiles molding materials are widely used , complex structure, forming several challenges and difficulties .
Airlines with special rubber sealing profiles using materials include foam material, pure rubber material, composite rubber materials, metal rubber composite , a variety of composite materials and so on. The difference in shrinkage characteristics of different materials , the interface between the binding force , such as compatibility problems of the molding material is more difficult.
From aviation to use special rubber pull tight plastic seals profiles environment, tend to design a profile section and the overall size of a large span . Small cross-section of 1mm cap sealing profiles , shaped like a large cargo door gate sealing profiles can often reach more than 10 m ; sections as simple as sealing strip profiles, such as variable cross-section of complex sealing profiles .
In order to produce the structure of variable cross-section rubber seal profiles, with enterprises to introduce European patent molding technology and equipment. The principle is mainly for cutting feed side and end to the computer through a metal skeleton common input signal , the output signal is controlled by the computer at the die cylinder moves , its movement toward Multijaw die for variable cross-section of the sealing strip extrusion . Simple variable cross-section can also be used with other automated or mechanical means control methods to control mold or cutting tool Multijaw actions to complete variable cross-section profile extrusion molding.
From the air with special rubber sealing  seal cable profiles designed structural point of view , many profiles are fully closed hollow structure, and there are fabric composite material or metal matrix material, forming very difficult. There are enterprises through the use of patented molding technology, fully closed structure of the hollow outer fabric to achieve the overall parcel fabric, fabric without joints and lap joints , sealing profiles smooth surface, size consistency .

Engineering mechanical seal selection method

mechanical security seals according to the working conditions and the different nature of the media, with high temperature, low temperature mechanical seals, high pressure, corrosion-resistant mechanical seals, mechanical seals and resistance to particulate media to adapt easily vaporized light hydrocarbon medium, mechanical seals, etc., should be based on different usefulness select a different structural types and materials of the mechanical seal.
Selection of the main parameters are: seal chamber pressure (MPa), fluid temperature (℃), working speed (m / s), the sealing properties of the fluid and the effective installation space.
Selection of the basic principles are:
1 according to the seal chamber pressure to determine the sealing structure using balanced or unbalanced, single face or double, etc.;
(2) according to the working speed, determine the use of rotary or static, hydrodynamic or non-contact type;
3 according to the temperature and fluid properties, determine the friction and auxiliary sealing materials, as well as the right choice lubrication, washing, heat, cooling, mechanical Security seals loop protection system;
4 According to the sealed space efficient installation, determine the use of multi-or single spring or springs wave springs, built-in or externally mounted.

How to select cost-effective rubber seals

O-ring is a rubber ring of circular cross section, because the O-section, is called the O-ring. Hydraulic and pneumatic drive system is the most widely used one. Usually in the Taiwan enterprises, Japanese companies called O Ring.
O-ring is a ring with a circular cross-section rubber tamper seals is mainly used for mechanical components under static conditions to prevent leakage of liquids and gases in some cases. O-ring can also be used as axial reciprocating movement and low-speed rotation of the dynamic sealing element according to different conditions, different materials can be selected with suitable.
O-ring is usually used when you try to use a large cross-section of the O-ring in the same gap in the case. O-ring is squeezed into the volume of the gap should be less than it is squeeze the maximum allowable value.
Different types of fixed or dynamic sealing applications where vehicle cargo seal, o-ring provides designers with an effective and economical sealing element. o-ring is a double-acting sealing element. The installation's initial radial or axial compression, given its initial o-ring sealing capability. Generated by the system pressure and the sealing force and the total synthesis of the initial sealing force of the sealing force, which increase with the system pressure increased. o-ring seal in the static case, showing a prominent role. However, in a dynamic appropriate occasions, o-rings are often used, but it is subject to seal the velocity and pressure limits.

Common thermal damage to the mechanical seal

Centrifugal pump mechanical seal failure due to overheating, failure is thermal damage, the most common failure of a face thermal heat damage deformation, thermal cracking, blister scars, carbonization, the elastic element missing bombs, rubber aging, permanent deformation , cracks, etc.
Heat pump seal face distortion and local thermal deformation of the overall thermal deformation. Sealing end face sometimes find many small isolated hot spots and discoloration area, indicating that seals in high pressure and heat under the influence of local deformation occurs distortions; sometimes found sealed end surface of a symmetric discrete bright band, which is mainly is due to irregular cooling, causing the end of local thermal deformation. Sometimes found inside the seal face wear is very serious, the larger the radius the more shallow contact marks until indiscernible. The inside edge of the seal ring may appear the phenomenon of edge chipping and jumped. The shaft rotates, the sealing continued leakage, and the shaft is stationary, not leak. This is because the seal is in operation, sufficient cooling the outside, while the inside severe frictional heating, thermal deformation is greater than the inside outward to thermal deformation, thermal deformation is formed inside the contact-type (n-cone angle) end.
Carbide, engineering ceramics, brittle materials such as carbon graphite high security cable seals ring, and sometimes there will be a radial end surface cracks, so that the sealing surface leakage increased rapidly, rapid wear on the couplings, which are mostly due to the sealing surface is dry friction, cooling suddenly Friction causes interruption rapid accumulation of heat damage to the formation of a thermal failure.
In the high temperature environment of the mechanical seal, graphite rings often find the surface pits, scar blocks. This is because when the resin-impregnated graphite ring exceeds the allowable temperature, the resin will decompose to form carbide precipitates durum and volatiles, scar formation, which greatly increase the friction, and to surface damage with high leakage.
High temperatures may reduce the flexibility of the elastic member, the sealing face of the closing force due to inadequate seal faces serious leak. High temperature metal bellows failure of such mechanical seal bomb that is a common and typical failure modes. Failure to avoid such an effective way to choose the right material and its bellows appropriate heat treatment.
High-temperature rubber id cable ties aging, cracking and permanent deformation of an important reason. Rubber aging, the performance of the rubber hardens, strength and elasticity, there will be severe cracking, resulting in the loss of sealing performance. In the high temperature fluid, the rubber ring to continue curing danger to loss of elasticity and eventually leak. Among the long-term high temperature seal, will become the same as the shape of the groove, the temperature remains constant, but also the seal; but when the temperature is reduced, the ring was quickly contraction leak leakage channel is formed. Therefore, we should pay attention to the use of various types of plastic temperature, and should avoid prolonged use in extreme temperatures.

Mechanical seal O-ring common faults and corrective measures

1, O-ring overheating
Overheating of the O-rings, usually due to excessive heat pump sealing tamper seals surface formed by the adverse conditions. Teflon 0-ring blue or black, 0-shaped rubber ring hardening and cracking. Close to the sealing surface is always the worst part of the situation.
Related Corrective Action: Check the circulation pump seal chamber case (if equipped cooler should also be checked) to see if there is blockage phenomena. Inspect the pump suction capacity reduced dry running, into the slag and other faults. Check the product based on the original provisions of the situation.
2, O-ring extrusion
A part of the O-ring is forced through a small gap will occur when the extrusion phenomenon. Or assembly of components in the assembly if the force is too large, or the operating pressure and temperature is too high, this extrusion phenomenon occurs. When adjusting seal element in place, if the size exceeds the limit, resulting in the formation of a large gap between the components of the situation also occurs O-ring extrusion. PTFE O-rings are curling, rubber O-ring being skinned or torn.
Associated corrective actions: Check the assembly and operating conditions to ensure that each part of the adjustment to the original Security ties design requirements or readjusted by the manufacturer.
3, O-ring failure
O-ring will occur when used as inappropriate swell, permanent deformation such as undercut, the consequences of the O-ring itself not only lose their original performance and fracture, but also to prevent the slider movement.
Related Corrective Action: Check the seal of the working conditions of the original product, see the material is appropriate, if appropriate, the response to the O-ring materials and dimensions, etc. re-matching.

Emphasis on the seal check valve

If the valve stem and the valve body bore machining of poor quality, or because of long-term use causes wear leaving the filler stem with the gap increases, the media will lead to leaks from the valve stem, a phenomenon known as the valve "upper seal leak." However, in the fermentation, the valve on the nylon zip ties check is often overlooked.

In the fermentation, because the fermentation process requirements, some of the fluid to the valve is not installed by, as in some of the fermentation tank, the sampling valve is to close the first valve fermenter, the valve in order to be sterilized prior to sampling, valve installation and fermented liquid flow is reversed, so as to install a small sampling valve at the bottom of an additional valve so that the steam flow. The sampling valve on the seal structure sealing requirements are very high, otherwise the fermentation broth may penetrate the sampling valve on the seal structure even leak from the seal structure, resulting in fermentation contamination.

At present, many domestic valve packing for multilayer structure, and the structure has the added filler rigid spacers, an upper sealing ring or a disc spring, thereby improving the sealing force of the self-regulating capacity, improve the sealing performance. In the event of the nylon zip ties leakage, and changes on the domestic valve seal structure is difficult, can be solved by replacing the filler type leak problem. For example, the current expansion of new alternative to conventional PTFE gland packing asbestos and expanded graphite packing, its wear and corrosion resistance, good sealing effect.

The valve sealing performance

Valves before and after the valve differential pressure on the valve sealing performance is analyzed theoretically, valves before and after the valve pressure difference is proportional to both the amount of leakage. But tests proved: in other conditions are the same, the leakage volume growth is increasing pressure differential over. Leakage between the pressure difference can be approximated by the following formula: G = M (N △ P2 + S △ P) where: M, N, S - constant coefficients, which depend on the material, the sealing surface processing quality, the sealing surface pressure and other conditions; △ P - pressure differential.
Sealing surface material and the processing status of the valve sealing performance of the sealing surface of the valve material and processing conditions have a significant impact leakage. As the remaining gap between the seal faces depends on the sealing surface micro-roughness, so that, if the use of steel materials, seals, resulting in sealing of the same, there must be greater than the pressure, the value must exceed brass system value than the pressure seal. The sealing surface of the processing state, such as a peak distortion, and sealing the gap size changes and other phenomena occur on the metal surface, it is clear that the performance of the surface properties of the base material have significant difference. Induced changes in the machining surface can affect the thickness of 50μm. Grinding the base metal is not exposed. Work is different from the metal surface tissue matrix organization. Geometry and material properties and microstructure geometry compared to little effect. Differences in the performance of metal, usually less than other factors. Sealing surface when working under low pressure conditions, the situation is more prominent. When the pressure ratio is higher than 40MPa, the surface roughness of the sealing performance is reduced, and the impact of the material is increased.

Properties of the medium on the valve sealing performance of the liquid medium is substantially on the leakage of the viscosity determined by the sealing valve in the same, the various conditions are the same, the viscosity of the medium viscosity smaller than the much smaller leakage medium . Gases and liquids compared to the difference more obvious (except for saturated steam, saturated steam is easy to ensure the sealing surface).

Hydrophilic surface properties of the valve sealing surface of the leak amount of hydrophilic properties due to capillary effect. When the cable zip ties sealing surface as long as a thin film, the need to increase the pressure of the water through the gap. As the metal surface with good hydrophilicity, kerosene can easily penetrate the gap casting and sealing connection. So, in some of the most critical situations, is the use of kerosene for the hydraulic tightness test. Filling the cavities of kerosene tightness test method, equivalent to approximately 0.3? 0.4 MPa pressure tightness test under pressure.

The presence of the sealing film of the valve sealing performance of the sealing film exists between the sealing surface has a significant effect on its sealing performance. When the sealing film on the surface, the destruction of the contact surfaces hydrophilic, so that a larger pressure difference is required to make the medium passes through the pores. In addition, dense sealing film on the surface of the channel to plug the media travel, improve the connection sealing. In the use of film sealing should pay attention: When the work process film is reduced, should be able to recover the oil film thickness. Oils used in the valve being not soluble in the media, nor should evaporate, hardening or other chemical changes.

The closing member of the rigidity and structural features of the valve closure member sealing performance and structure of the rigidity is due to the elasticity of the part. The closed valve closure member is not absolutely rigid, but has a certain flexibility in the pressure of the medium, the size is changing, which force causes the sealing surface interactions. To compensate for these changes on the sealing performance of the closure member, the wire seal sealing surface preferably has a smaller rigidity of the elastic deformation is as large as possible.

Pipe joint sealing timely inspection car

In the use of vehicles, often appear oil leakage. Common vehicle leaking main reasons: product quality, poor materials or workmanship; tighten the nut force uneven or slippery silk buckle broken off as a result of the work Songkuang failure; sealing material wear off limits after prolonged use, aging deterioration , deformation failure; lubricants add too much oil is too high or add the wrong oil; vent plug, check valve clogged, due to pressure difference between inside and outside the enclosure role weaknesses often lead seal leakage. Always pay attention to check the tightness of pipe joints, with particular attention to the following places:

First: emphasis on cushioning effect. Automotive Parts standing position plays a leakproof seal between the gasket role. If the materials, production and installation of quality does not meet the technical specifications, would not achieve the role of leak-proof seal, and even accidents.

Second: the car regulations required all kinds of nuts are tightened to a torque. Pressure is not too loose tight liner would leak; tight will make the metal bumps or holes around the threaded screw slip caused by oil spills. In addition, the oil pan drain plug back if not tighten or loosen off, easily lead to oil loss, and subsequent "Burnt axle" machine damage accident.

Third: the timely replacement of seal failure. Many parts of the vehicle moving home due to improper installation, journal and id cable ties edge misalignment, deflection and dumped oil. Some seals used for a long time due to aging of rubber and lose their elasticity.

Fourth: Avoid one-way valve, vent blocked. Resulting tank shell temperature, gas filled the entire space, emissions do not go out, so that increased pressure tank shell increased oil consumption and replacement cycles. After plugging the engine breather system, increasing resistance to movement of the piston, so that fuel consumption increases. Pressure difference between inside and outside the enclosure role weaknesses often lead seal leakage. Therefore required to carry out regular inspection of vehicles, and clear, clean.

Fifth: to properly solve all kinds of pipe joint seals. Car union nut often disassembly, easy to slip off the buckle and loose wire will cause oil leakage. Replacing the union nut with conical grinding method to solve their seal compression and resolve the nut rail car seals.

Sixth: Avoid wheel thrown oil. Wheel bearings and excessive grease cavity, or the seal assembly is wrong, poor quality and aging failure; frequent cause of wheel brake temperature is too high; axle nut loose, and this will lead to rejection of the oil hub.

A detailed analysis of the characteristics of the sealing

1) light weight, telescopic strength, does not absorb water (instead of the traditional three oil four felt, asphalt, cedar wood panels and other materials). Products environmentally friendly, simple construction, seepage, leakage, security seal labels effect.
2) corrosion resistance, aging resistance, high temperature +80 ℃ ~ -45 ℃ not flowing, no distortion, no embrittlement, long service life.
3) with independent opening bubble structure, a special type of joint appearance of honeycomb panels uniformly distributed pores, hair can not fight with the cement / adhesive sealant tightly integrated, adapt to the natural expansion and contraction of change, enhancing seams security seal labels Sealing expansion sealing effect.
3 vulcanized EPDM rubber seal

In sealing elastic persistence than PVC strips have greatly strengthened, but due to the need of microwave curing line shape, machining high energy consumption, which is usually 20 times more than PVC processing, products can not be recycled, environmental damage, not the national advocacy products. In addition, the proportion of this type of product materials (1.4 and above) with PVC type quite (low vulcanized EPDM seals greater proportion) of the window with PVC strips similar rate, the use of relatively high cost, doors and windows are difficult to accept.

How to solve the hollow door sealing problems during installation

Hollow door easy installation problems encountered what?
A hollow doors installed in the field, the assembly size control is not good, resulting in a mutual position of mutual dislocation lap security seal or lap size is insufficient, or because of the pressure foot and there is a gap for a fixed hollow without closing the door frame fastening screws rubber sealing, the sealant sealing the sealing parts of uncleaned surfaces.
2, hollow doors with poor sealing material, such as plastic strips excellent anti-aging time is short, use sealant outdated or counterfeit fake plastic, anti-displacement capability, easy to crack and so on.
3, the hollow door manufacture precision reach the quality requirements, with the gap is too large, after assembling parts to be bonded tamper seal sealing material is not painted directly assembled.
Solution is as follows:
1, the filling material is not covered with the gap between the frame and the wall, forming a Valley phenomena or cracks.
2, fixed windows and doors adjustment pad remains in the door frame, or removal of a second after no further filling.
3, the door after the installation is not outside the door and wall joints are sealed, or seal failure.

Automotive sealing industry status and development

Currently, the auto body sealing materials commonly used in EPDM rubber (EPDM) or polyvinyl chloride (PVC). EPDM rubber (EPDM) is ethylene, propylene monomer is added small amount of non conjugated diene elastomeric polymer material formed, which structure is characterized by the molecular chains of the polymer are all unsaturated double bonds, and in the branched-chain by introducing an unsaturated double bond, which has excellent weather resistance, heat resistance, ozone resistance, UV resistance and good processability and low compression resistance, is the production of automobile sealing material of choice, generally vehicles produced using EPDM seal material life of up to ten years. PVC materials used in surface decoration is more demanding automotive seals, such as the roof trim, inner and outer window seal. With the auto industry, can be used in automotive sealing strip processing and production of new materials more and more. Wherein the thermoplastic elastomer (TPE) material is the most prominent of a new type of environmentally friendly materials, it is mainly divided polyolefin (TPV, TPO); polyurethane (TPU); polyester (TPEE): polyvinyl chloride (TPVC ); polyamide (TPAE) and other types of thermoplastic elastomer. The seal used in automotive products mainly polyolefins (TPV, TPO) thermoplastic elastomer material, such materials and glass friction coefficient, wear resistance, can be used as automotive glass guide groove, outside door glass seal strip and part of the auxiliary seal materials. In addition, a variety of automotive sealing auxiliary materials increasingly focused on environmental requirements, such as various environmentally friendly adhesives, water-based coating materials applications.

Automotive sealing products involved in the technical standards mainly by material performance standards, product performance standards and test methods Standard three parts. In other countries, material, product performance standards of the automotive OEMs usually corporate standards, test methods, material properties of the standard test methods commonly used public infrastructure standards (ISO, DIN, ASTM, JIS, etc.), and product performance test method usually used each automotive OEMs corporate standards; in the country, as its own brand of automotive OEMs started late, automotive container seal products, technical standards primarily by automotive sealing industry associations and enterprises to establish and maintain, with the continuous development of China's auto industry , the major OEMs are gradually establish and improve their own standard system and standard system for the automotive industry with the world standards.

In recent years, China's auto industry growth by leaps and bounds, the global financial crisis and the decrease in car production and sales background, China's automobile production and sales both across ten million people. Not just the world's leading automobile manufacturing companies valued this huge Chinese market, the same as auto parts automotive sealing industry, the main seal foreign manufacturers have or are stationed in the Chinese mainland, or joint venture, or sole proprietorship, have build factories in the automotive OEMs around the present, these enterprises also mainly for the production of passenger cars based in Europe, America, Japan, Korea joint venture companies supporting the production of automotive automotive sealing Cable tie  strip. With these foreign automotive sealing enterprises, the domestic industry exists independent research firm inadequate investment, lack of R & D experience disadvantage.

Bottled water bottle mouth sealing insufficient ink can penetrate

Typically, summer beverage sales season, often seen on the streets of the provincial capital will store a variety of beverages soak in ice water for customers choice. And long-term immersion in water and bottled beverages, because of its lack of sealing the bottle, and increased "secondary pollution" possibilities. For example, employees working in a supermarket in Taiyuan revealed that summer, in order to meet the needs of consumers, supermarkets will be a lot of bottled water in a swimming pool filled with tap water, and some beverage store at least three days, if the bottle meter seal is not good , that was really very unsanitary.

"Lid to drink has become a habit, and that is for the convenience of bottled drinks." Most consumers are so understanding, and their health situation, most do not quite understand.

In this regard, Taiyuan Bureau of Quality Supervision, laboratory staff, said threaded portion of beverage bottles only play the role of reinforcement is not closed, it may lead dust, bacteria "invasion", resulting in the bottle secondary pollution.

Reporters learned that allow enterprises to "bother" Modify packaging is an important reason is that regulatory gaps, no criteria to guide. It is understood that the beverage bottle material is clearly defined, and the threads of the bottle and hygiene standards is still blank, "We generally only bottled water, check the specifications, measurement units and water quality, and never checked cap airtight. "Taiyuan Bureau of Quality Supervision of a staff member said, the key is not legal. "Now beverage products is to look at the final product is usually checks pass rate, which is the only requirement of manufactured products without bacterial contamination." The staff said, but from the factory until the consumer to drink this process, the beverage can easily be two secondary pollution, place the longer transport the less confined, the pollution is more serious.

Xiaobian Summary: So, in the future for a long time, bottled drinking water bottle bolt seal its still hard to get the issue resolved. Regulatory authorities should be made as soon as possible countermeasures to protect the lives and safety of consumers. Social progress, science is also progress, people's living standards are making progress, but the standards for consumer products should also be an improvement and enhancement of the old unreasonable incomplete standards, it should be based on the current national development improve the situation and make the appropriate improvements.

Renovation and floating seal seals

Seals transformation, instead of floating seal comb labyrinth seal modified to composite turbine in the power sector reform on the bearing housing seals for example, simply use the outer ring and the inner ring to replace the original floating inside block, other structure unchanged , maintaining the original assembly relationships, convenient and reliable. Specific transformation, according to the original comb truck seal assembly space, the actual operating conditions and parameters, use of different materials and different types of floating seal, ensuring design and production of each set of products are "tailored" to resolving user most want to solve the problem.
Application: dehumidifier, air conditioning, and other special moves. FX composites floating floating seal ring using a special composite material and scientific formula sintering, a lightweight, abrasion, temperature, self-lubricating characteristics for various low-temperature lubrication medium and small sized cooling medium dynamic plastic strap seals.
A resistance to media: strong resistance to steam, oil and chemical resistance. Dielectric properties, not easy to aging;
2 can be self-lubricating: low coefficient of friction and self-lubricating properties, even in the dry mill when it will not hurt axis;
3 low expansion: in the temperature range, even with a high temperature dimensional stability can be maintained.
4 high damping: a strong damping performance, improve the smooth running

Fixed ball work performance and characteristics

Fixed ball valve, ball valve is a new generation high performance, suitable for long-distance pipelines and general industrial pipelines, its strength, safety, resistance to harsh environments, etc. in the design for a special considerations applicable to a variety of corrosive and non-corrosive media. It is compared with the floating ball, the work, the ball valve before the fluid pressure force generated on the entire transmitted to the bearing, the ball does not move to the seat, the seat and thus not exposed to excessive pressure, so the stationary valve The torque is small, seat deformation, stable stainless steel cable ties performance, long life, suitable for high pressure, large diameter applications. Advanced spring pre-seat assembly, with self-tightening properties, to achieve the upstream seal. Each valve has two seats in each direction can be sealed, so the installation does not restrict the flow is bi-directional. This valve is usually installed horizontally.

Fixed Ball Valve Features

An effortless operation: the upper and lower ball bearings, reducing friction, eliminating the inlet pressure pushing the ball and seal sealing seat and a huge load caused by excessive torque.

2, the sealing performance and reliable: PTFE single material embedded in a stainless steel valve seat seals, metal seat ring end features to ensure adequate spring preload, the valve sealing surface in the course of wear, under the action of the spring Valve continues to ensure good sealing performance.

3, structural fire protection: To prevent the sudden emergence of heat or fire, so that PTFE seals burned, there is a greater leakage, and contribute to the fire, the fire set between ball and seat Security ties sealing ring, when burned in the ring, In the spring force, the valve seat sealing ring on the ball quickly to form a metal to metal seal, play a certain degree of sealing effect. Fire test compliance APl6FA and APl607 standards.

4, automatic pressure relief function: When the valve chamber stagnant medium pressure abnormally elevated over spring preload, the seat back from the ball, to the effect of automatic pressure relief, pressure relief valve automatically reset after.

5, the discharge line: both above and below the body excrete larvae L, you can check valve for leaks, at work, the valve is fully open or fully closed, relieved pressure in the chamber, can directly replace the packing; possible emissions retentate chamber to reduce pollution to the valve medium. Fixed ball is widely used in food, medicine, petroleum, chemical, natural gas, steel, environmental protection, paper and other media delivery line cut or circulation. This device can also be injected to the appropriate cleaning agents or lubricants on the sealing surface cleaning.

BS asphalt elastic sealant stronger performance characteristics

SBS modified asphalt elastic sealant seal strap based thermoplastic elastomer SBS modified bitumen, add softeners, antioxidants and other additives, the use of second-order blending technology, uniformly mixed into the surface waterproof material.

SBS modified asphalt elastic sealant features: high flexibility, low modulus, elongation big, warm feeling small, UV resistance, lower prices and convenient construction, non-stick at, do not pollute the environment. SBS modified asphalt elastic sealant for buildings roofing, siding seams, waterproof seams underground construction, building repair cracks.
SBS modified asphalt elastic sealant high security bolt seals construction requirements are: using a torch or torches hot melt construction process, the construction of the sealant with grass while heating, drying the grassroots level to improve the adhesive force.

The application of new sealer advantages

New ground:
1, prime ground + sealer advantages:
Simple operation, showing the original texture of the ground after hardening and shiny sand can not afford, can not afford to dust, waterproof, anti-oil, anti-chemicals.
2, wear-resistant floor + sealer (Security ties)advantages:
Color, colorful, color can be designed according to need, a substantial increase in hardness and wear resistance, waterproof, anti-oil, anti-chemicals.
3, terrazzo + sealer advantages:
Colorless liquid permeable cover not move the original texture rendering shiny marble, a combination of the ground greatly improved wear resistance with anti-water, anti-oil, anti-chemical outstanding performance.
4, marble + sealer advantages:
No longer need to carry out maintenance on the marble various properties were significantly increased, with some anti-skid function.

Old floor renovation:
1, old floor drawbacks:
Affect the plant image, and on the effect of the customer visit, affect workers' job motivation, affect product quality.
2, sealer (Cable tie)new refurbished concept:
Refurbishment process without downtime (workers do not lay-off, the device does not move), one-time investment, lifetime use, comprehensive approach to improve the image, creating high-yield customers.

Seal Products

Automotive oil seals series products:
Including the engine crankshaft valve stainless steel wire ties, gearbox oil seals, shock absorber oil seals, air conditioning compressor seals, power steering oil seal, axle seals, brake system seals, cooling water pump seals, gearbox oil seal;
Motorcycle oil seal products:
Various engine rotary seals, shock absorber oil seal;
Standard low pressure rotary oil seals:
These products are divided into two major categories of metric and imperial. Metric sizes of products in full compliance with national and international standards.
Mineral oil applied to the seal and other media such as water, air, chemical fluids with low viscosity;
High-pressure rotary oil seals:
200 bar maximum working pressure, the working pressure is greater than 5 atm, the oil seal <pv> values ​​have reached 500 bar · m / s, more than 20 times the highest in the world.
Special fluid pressure rotary seal cables:
Mainly applicable to a variety of non-fossil oil medium such as water, compressed air, low viscosity fluids such as chemicals;
Pressure reciprocating oil seals:
Single stage Maximum working pressure up to 500 bar, maximum line speed of up to 3 m / s, the maximum value of up to 1500 reciprocating <pv> bar · m / s, but also according to the customer's needs to develop "personalized products."

Seals series product introduction

PTFE seals
Rubber seals
PTFE seals
Fluorine rubber products
Mechanical seals
Seals main categories are: PTFE seals, PTFE seals, rubber seals, mechanical seals
PTFE seals
PTFE tubing rods, PTFE sheet oriented film cutting boards, F4 seals series, all kinds of machinery parts fill series, packing, nylon, Teflon rods, tubes, all kinds of sealing gaskets, molded board , cutting boards, film, machinery parts, PTFE packing, carbon packing, Kevlar packing, high water base plate
Rubber seals
Sealing gasket, seals, seals, all kinds of O-rings, oil seals, combination pad, rubber speed humps, rubber block cars, angle, rubber road cones, rubber water seals, pure rubber seals, three composite Bolt seal, composite skeleton seals, sponge seals, rubber seals, decorative pieces, flocking seals
PTFE seals
PTFE seals, PTFE gasket, PTFE ring, PTFE rod, PTFE tube, PTFE sheet
Mechanical seals
Lightweight pump mechanical seal, medium pumps with mechanical seals, mechanical seal for agitators, engineering mechanical seals
Keywords: plastic seal, seal products, PTFE seals, rubber seals, automotive rubber seals, rubber seals, hydraulic seals, O-rings, combination pad, oil seals, rubber rollers, rubber tire, conveyor belt , PTFE, silicone rubber, fluorine rubber products, combination pad, shaped pads, shaped rings, hydraulic parts, mechanical seals, Viton seals, EPDM seals, static seals, dynamic seals , sealing materials, hydraulic and pneumatic seals, seal, seals, sealing gasket, pure rubber seals, rubber water seals, rubber water seals, pure rubber seals, three composite seals, composite skeleton seals, sponge seals, rubber seals, decorative pieces, flocking seals, mechanical seals engineering

How to choose and use seals

In the purchase and use of seals, the user should always pay attention to the following requirements, to avoid unnecessary quality problems:
In the purchase and use of seals, the user should always pay attention to the following requirements, to avoid unnecessary quality problems:
1 Production
Our rigorous selection and long-term experience, has produced a series of supply channels, we supply, is the seal industry's most comprehensive, so in the production of quality, can be a good guard, remained stable high levels. Together with our insistence on quality seals, not the blind pursuit of high profits at the expense of the customer quality requirements for numbered seals.
(2) Storage
If we stand on the position, to produce seals, must pay attention to the supplier or shop know how to take care of seals seals, if stored improperly supplier, to the customer, is likely to be scrapped seals, because the store seals, is a set of specific requirements, such as the best kept at room temperature below 30 degrees Celsius, to avoid high temperature security labels aging; seals must be stored in a sealed package, avoid moisture in the air or dust exposure; seals must avoid bright light, to avoid seal is ozone in the air attack or premature aging, so we recommend that customers purchase in selecting suppliers, we must look at whether the storage seal properly, or whether seals how to provide high-quality production plant The seal may also be sent to the customer in the hands of just scrapped seals.

Non-contact type mechanical seals

You discuss mechanical seal, it is important that you figure out the difference between various sealing systems. There are three basic types: fluid lubricated mechanical seals, gas lubricated mechanical truck seal and touch off style or called non-contact gas lubricated mechanical seals.
The difference is in the fluid-lubricated sliding surface of the seal between the fluids. As a result, the mixed friction seals are usually applied use mixer. For dry running seals, two sliding surfaces in direct contact with each other. On the other hand, the non-contact gas-lubricated mechanical seals, in the operation of the sliding surface is not in direct contact. There are 1 ~ 5μm wide gap separating the surface, which is why this is referred to from the seal member often causes seal. When you double-mentioned gas damper seals should have this distinction. From this point on, we will only discuss the following non-contact gas lubricated mechanical security seals.
Gas seals are how to work it? At work, in between the two sliding surfaces should have a layer of only a few Xie meter gap, in order to produce voids, two sliding surfaces should be mutual disengagement. To achieve this, in the manufacture of a three-dimensional ring groove, which ensures the air static and dynamic play. In the seal member at the pressure difference generated aerostatic effect, while the aerodynamic effects generated by the rotation. The resulting force balance lift and closed, thereby forming a width of 1 to 5 Xie seal gap.

Engineering mechanical seal selection

Mechanical seal according to the working conditions and the different nature of the media, with high temperature, low temperature mechanical seals, high pressure, corrosion-resistant mechanical seals, mechanical security seals and resistance to particulate media to adapt easily vaporized light hydrocarbon medium, mechanical seals, etc., should be based on different usefulness select a different structural types and materials of the mechanical seal.
Selection of the main parameters are: seal chamber pressure (MPA), fluid temperature (℃), working speed (M / S), fluid properties and the effective seal installation space.
Selection of the basic principles are:
1, according to the seal chamber pressure to determine the sealing structure using balanced or unbalanced, single face or double, etc.;
2, according to the working speed, determine the use of rotary or static, hydrodynamic or non-contact type;
3, according to the temperature and fluid properties, determine the friction and auxiliary sealing materials, as well as the right choice lubrication, washing, heat, cooling, mechanical wire seal loop protection system;
4, according to the sealed space efficient installation, determine the use of multi-or single spring or springs wave springs, built-in or externally mounted.

Hydraulic seals work environment

1) of the sealing surface relative speed is higher, obviously hydraulic seal and the sealing surface increases friction and wear, easy to reduce the hydraulic seal of the seal.
2) The higher the working pressure of the hydraulic fluid, the hydraulic seal and the sealing surface of the additional contact stress inevitably large, easily lead to premature wear of the hydraulic bolt seal, thereby reducing the hydraulic seal of the sealing performance.
3) other factors, such as ceramic factory ceramic powder, dusty, humid air and water droplets can easily contaminate hydraulic oil, and greatly limits accelerated wear of hydraulic seals, hydraulic printed cable ties to reduce sealing effect.

Rubber seals in the performance of rubber

Rubber, with plastics, fibers known as the three synthetic material with high elasticity and excellent elastic polymeric cable sealing material. The first is the biggest characteristic of rubber elastic modulus is very small, and high elongation. Second, the rubber has a very good resistance to air permeability and resistance to various chemical media and electrical insulation properties. Some more special synthetic rubber with good oil resistance and heat resistance, rubber can resist fatty oil, lubricating oil, hydraulic oil, fuel oil and solvent oil swelling; rubber cold can be as low -60 ℃ to -80 ℃, Rubber heat can be high to +180 ℃ to +350 ℃. Rubber is also resistant to various Flexing, bending deformation, because hysteresis loss. Characterized in that the third rubber rubber with a variety of sealing material and use, blend, composite, thereby modified, the rubber seal products get good overall performance.
These basic properties of the rubber, the rubber industry to become an excellent damping, sealing, flexing, abrasion, corrosion, insulation and bonding and other materials.
Rubber seal (Rubber seals) is sealing device in a common base class components, and sealing the leak in this contradiction plays a very important role. In the course of human conquest of nature to solve leakage and sealing problems. Been promoting technological progress, to prevent and reduce environmental pollution an important way. Rubber marker cable ties are widely used in sealing technology for a class of rubber products. Because rubber has valuable elastic polymer material, a wide range of temperatures, in different media will be given a greater smaller deformation stress, this deformation can provide contact pressure compensating leakage gap, to seal the purpose of .

High-precision rubber seals without mold processing system has been introduced

Kind of technology, first appeared in a foreign country, has been the monopoly of a few foreign companies. The localization completely independent intellectual property rights, to fill the domestic rubber seals without mold processing technology gaps, breaking our long-term dependence on foreign and foreign high-end rubber plastic security seal rubber seals CNC system situation. Currently, the top ten this device has successfully passed the acceptance stage and had access to applications, products in short supply.
Domestic production of rubber seals, rubber sealing products usually will figure into the mold chart, first the metal mold and then molded rubber and plastic raw materials for processing or casting, injection molding, etc., from product design to production of qualified longer product cycle, in addition, the technology used simultaneously molding and heat curing, so there were problems cold shrinking, it is difficult to ensure a sufficiently high precision.
In recent years and foreign high-precision rubber seals, has adopted advanced technology methods, namely the rules now after curing rubber raw materials, and then without turning mold manufacturing metal cable ties, not only greatly improved the product manufacturing precision and production efficiency, also contributed to the design of the host device upgrades and quick maintenance solutions. High-precision rubber seals CNC machining is the key to this advanced technology, currently there is no other similar technology enterprises with independent intellectual property rights.
High-precision rubber seals CNC machining systems, not only has simple operation, high precision, fast production efficiency, product quality and stability, etc., and can quickly achieve the development of new rubber seals designed to solve the domestic alternative to imported high-precision seals Rubber seals equipment and equipment problems, to fill the gaps in the technical field. For different needs of industry users, for serialization and specialized high-precision rubber seals in-depth development.

Butterfly structure works for environmental analysis

1 Classification by structure
(1) Center sealing butterfly valve
Aluminum Pneumatic Butterfly
QGSY ordinary pneumatic valve (2) single eccentric sealing butterfly valve
Plastic pneumatic valve (3) double eccentric sealing butterfly valve (4) three eccentric sealing butterfly valve
2 Press the sealing surface material classification
(1) soft sealing butterfly valve. 1) Sealing of non-metallic materials, non-metallic soft soft material. 2) Sealing material by a non-metallic rigid metal soft material. (2) metal seal butterfly valve. Sealing hard materials from metal to metal hard material.
3 Press Seal type classification
(A) Mandatory sealing butterfly valve 1) elastic sealing butterfly valve. Sealing pressure when the valve is closed by the valve plate extrusion seats, seat or valve plate elasticity of 2) applied torque seal security butterfly valve. Sealing pressure applied to the valve shaft by the torque generation (2) pressurized sealing butterfly valve. Sealing pressure from the valve seat or valve plate cable sealing element pressurized bomb pieces produced (3) self-sealing valve. Sealing pressure than the pressure generated automatically by the media.
4 Press Working pressure classification
(A) vacuum valve. Working pressure is lower than standard atmospheric calendar butterfly. (2) low-pressure valve. Nominal pressure PN <1.6MPa butterfly. (3) the pressure valve. , PN 2.5 - 6.4MPa butterfly. (4) high-pressure valve. Nominal pressure PN is 10. 0 - 80.0MPa butterfly. (5) high pressure valve. Nominal pressure PN> 100MPa butterfly. Butterfly butterfly plate mounted on the pipe diameter direction. In the valve body, the cylindrical passage, the disc-shaped disc around the axis of rotation, the rotation angle is between 0 ° ~ 90 °, rotation to 90 ° when the valve is fully open cards. This type valve in the pipeline should generally be installed horizontally.

Pneumatic butterfly valve Introduction

Pneumatic valve pneumatic butterfly valve is composed of pneumatic actuators and butterfly valves. Pneumatic butterfly valve is used with the rotation of the circular disc Kom do hoist, so as to enable the operation of pneumatic valves to achieve the main shut-off valve used to do, or can be designed to have a regulating valve and regulate the function of segment, in low voltage high current butterfly The use of medium-caliber pipes more and more.
Pneumatic valve
Butterfly butterfly plate mounted on the pipe diameter direction. In the valve body, the cylindrical passage, the disc-shaped disc around the axis of rotation, angle of rotation between 0 ° -90 °, rotation to 90 ° when the valve is in the fully open state. Butterfly simple structure, small size, light weight, by only a few parts. And just rotate 90 ° to quickly open and close, easy to operate, while the fluid control valve has good features. Valve in the fully open position, the disc thickness is the only medium flows through the resistance of the valve body, through the valve so that the pressure drop generated is small, it has a better flow control characteristics. There are bombs and metal sealing butterfly valve sealing two kinds of cable marker ties type. Elastic sealing valves, seals can be mounted on the body or attached to the disc periphery. Metal sealed valve generally higher than the elastic sealing valves, long life, but it is difficult to completely seal. Metal seal can accommodate the higher operating temperature, the elastic truck seal is a temperature limit of defects. If the requested use as a flow control valve, main valve of choice is the right size and type. Butterfly structure principle is particularly suitable for the production of large diameter valves. Butterfly not only in oil, gas, chemical, water treatment and other general industries are widely used, but also used in thermal power plant cooling water system. Common butterfly valve wafer type butterfly valve and flange type butterfly two kinds. Wafer type butterfly valve is connected to the valve stud in two pipe flanges, flange type butterfly valve is a valve with a flange bolt flanged ends of the valve in the pipe flange.

Hydraulic seals with plastic lubricant

Ingredients added to plastics in order to reduce friction plastic molding processing, improve the processing performance additives, known lubricants. External lubricant and plastic lubricants are lubricants of the points.
First, external lubricants and lubricants
1 external lubricant
External lubricant for reducing plastics processing equipment and processing materials or products, metal security seals and the friction between the metal sheet or adhesion. Such as reducing the melt and the injection molding machine, extruder screw barrel, or with friction between the product and the friction between the mold and so on.
External lubricant requirements are:
1) Table and tension, the polymer can reduce the friction between the metal surface.
2) the compatibility with the polymer is small, in the plastic processing process is easy to migrate to the surface of the material.
3) containing a metal affinity polar groups in the polymer sheet can be formed toward the metal lubricant layer oriented in polarity.
In addition to the external lubricant ingredients may be added to the plastic, but also can be rubbed on the metal mold and, in this case referred to as the release agent or anti-adhesive, indicative seal plastic additives generally does not include the column.
2 lubricants
Lubricants for reducing the melt processing of plastics friction between the resin molecules, lower melt viscosity, to increase the flow of molten material, is conducive to plastic processing.
Internal lubricant requirements are: the resin molecules should have proper compatibility, the compatibility of the small room, with increases in temperature, increasing the compatibility, the melting temperature of the polymer, with a better compatibility.
Lubricants and plasticizers difference: While the lubricant inside the plastic may promote fluid flow, but does not affect the material's physical and mechanical properties of the solid state, because a very small amount of lubricant, generally only a few thousandths of ingredients , far less than the amount of plasticizer. Lubricants can be added to plastics ingredients.
Most lubricants both internal and external lubricant dual function.

Manufacturing equipment and testing instruments there are new developments

Seals production equipment and detection technology is moving towards automation, low cost, high reliability direction.
In the rubber mixing equipment, with automatic batching and mixing process of automatic control mixer system, effectively to achieve energy efficiency, reduce environmental pollution, while manufacturing high quality rubber compound material. To improve the effectiveness and efficiency of mixing, research focused on the manufacturer mixer rotor shape. Kobe Steel Mill and Farley children developed 4WH rotor respectively and ST rotor mixer, Japan's Mitsubishi Heavy Industries developed GK-E rotor focused productivity.
Molding process, the foreign widely used and efficient, advanced and high-quality rubber injection molding processing technology. Production of small products, reciprocating screw injection machine, large size products with a screw plunger-type injection machine, are effective to improve the appearance of quality and performance seals, save raw materials. Paker produced O-ring, using the injection molding machine to make a small burr products, frozen with liquid nitrogen, trimming, trimming plastic pellets and water stone washed three processes, product appearance reached a very high level.
Vulcanization process equipment, at present, many domestic manufacturers equipped with a vacuum barrier seals tablet and injection machine, vulcanizing machine is also for ordinary circulating oil heating transformation, in order to ensure process stability.
While manufacturers also attach importance to design software secondary development, with good mold cavity materials processing flow analysis, manufacturing aspects of CNC equipment has been widely used precision molds, and the apparent quality have reached a very high level. Greatly promoted China's technological development rubber sealing industry.
Detection technology, the latest development is the use of an optical system, such as: Freudenbezy used by companies such KMK developed third generation of new optical system completely replaced the manual inspection, success will seal quality testing is fully integrated into the production process, which kinds of image processing systems to achieve a high detection speed and detection accuracy can detect the tiniest seal surface defects, such as cracks, bubbles, impurities and slip lines.
Domestic companies have introduced a seal measuring tension of the oil seal lip of the oil seal primarily on detection means for detecting pressure changes measured properties of the oil seal lip sealing gas detector (Italy), having a higher detection rate, per hour can be detected 1200-1800 a metal seals.
In the manufacturing process has been widely used CNC machine tools, professional mold manufacturing company has been basically achieved full CNC. Precision molds, and the apparent quality have reached a very high level. At present, the domestic rubber seals enterprises there are many companies equipped with CNC machining equipment, mold design and machining applications in CAD / CAM has accumulated a lot of experience.

Industrial manufacturing decision seal industry development potential

Industry, who tend to believe that seal is a small thing, but it is a sealed continuous operation is very important for industrial technology products. Reform and opening up, because of lack of attention, barrier seals industry has long been considered a small but complex areas, development is slow, a lot of small businesses can not form a production and quality management. With domestic manufacturing level, this situation has begun to change rapidly.
With the rapid development of China's machinery industry, especially the automotive industry and the development of the electronic communications sector, China seal industry already has an irreplaceable practical significance and far-reaching development of the industry connotation.
In the new international environment, global seal products manufacturing base will continue to transfer to China. China seal industry will usher in a period of development by leaps and bounds, and will also Chinese new industrialization development and make greater contributions.
According to "China's economic operation of hydraulic and pneumatic sealing security seal industry analysis," the statistics, hydraulic, pneumatic and sealing 290 major business statistics, the industry overall efficiency index reached 170.81, 214.97 which seal industry, machinery industry is far higher than the national average. 2007 fourth quarter gross domestic sealing industry achieved sales revenue 3.604 billion yuan, an increase of 25.27% over last year
China Development Industrial Manufacturing How much potential, there is much sealed the development of enterprises.

Let distinctive seat sealing performance

Tight sealing of the valve is extremely important in terms of users, the current from the valve member and the valve actuator on both structural improvements to tightly closed. Both can be cut using a throttle valve can be used to save the investment. Supply pressure of 15 to 35 lb / inch thin film type actuator 2, for manual or automatic operation of the shut-off valve structure, do not develop high sealing force seat species. If you want this species, they will be very bulky, and in throttling the speed of movement of the valve stem will be very slow. Want to have a small amount of leakage, because the valve seat sealing force can be smaller.
Seat seal - plug and seat alignment and exposure, including the joints of the structure and the load force.
Seal - metal finishing parameters, joint widths and metal plastic deformation tight seal.
Leakage - from different structural joints sealing parameters and the amount of leakage can be expected.
Tightly sealing plastic deformation of a material to a surface of the "waviness" and the other surface roughness, used to block a straight leakage path; so that both these paths become long and tortuous. The sealing force is far below the compressive stress, the compressive stress will cause the entire joint surface plastic deformation; Therefore, the contact portion is apparent. In fact, only the highest point of each surface of the contact, the concentration of forces may exceed the yield point of the valve closure member is plastically deformed above the point. Further Security ties off the valve seat to a higher load to achieve the same degree of tight, has been crushed to the particles, stabilized state.
1 Stellite 6 positive self-sealing welding hardened valve seat
2 seat seal welding underwater gas testing
3 seal welded seat face again after extension
4 with measuring instruments and gasket seat angle end, to determine the ideal wedge angle
5 on the seat surface grinding to match the corresponding wedge angle
6 wedge seating surface of the lap
7. Assigned ideal match wedge, hooking the right place and on the body
8 After assembly, the valve housing, valve seats, rear seat fillers and zero leakage pressure test conducted
Large-volume, high-pressure discharge system, taking into account the pressure drop needs to be properly test the strength of the elastic material sealing and fixing methods. At high loads, often resulting in a fluid elastomer is equivalent to and may be extruded, unless the load is locked or limit the use of metal to metal. Some designs allow soft cargo seals as the first seal, then closed with a metal on metal parts as a second sealed to prevent soft seal rupture.

Corrosion Analysis of the mechanical seal

mechanical security seals, also known as face seal (Mechanical End Face Seal), is a dynamic seal rotating shafts. Mechanical seals, reliable performance, small amount of leakage, long life, low power consumption, do not need frequent maintenance, and can adapt to the production process automation and high temperature, low temperature, high pressure, vacuum, high speed and a variety of strong corrosive medium, containing solid particles media and other harsh mining sealing requirements.
A mechanical seal - metallic ring corrosion
First, uniform surface corrosion. If the metal ring surface contact with corrosive media, and the metal itself impatience corrosion, it will produce surface corrosion, the phenomenon is leaking, early wear and tear, damage, sound and so on. Uniform corrosion of metal surfaces and non-film forming two forms, free film very dangerous metal corrosion, the corrosion process in a certain speed, which is mainly caused by the errors selection. The corrosion film, the passivation film characteristics generally has a protective effect, but the metal material used for the sealing ring, such as stainless steel, cobalt-chromium alloy such as a passivation film on the surface friction of the end face destruction, under hypoxic conditions New film is difficult to produce, so that galvanic corrosion intensified.
Second, stress corrosion cracking. Metal in corrosion and tensile stress while under the effect of the first cracks in the weak areas, and then to develop in depth, resulting in rupture, known as stress corrosion cracking, the choice of surfacing and cast iron carbide, tungsten carbide, titanium carbide seal ring, prone to stress corrosion cracking. The radial sealing ring generally divergent crack, and can be one or more. These cracks communicate the bolt seals faces, accelerated wear of the end face, an increase of leakage.
Second, the mechanical seal - metallic ring corrosion
First, the graphite ring corrosion. Impregnated with a resin impermeable graphite ring, its corrosion for three reasons: First, when the face overheating when the temperature is higher than 180oC, to break away from the resin impregnated graphite ring, the ring wear down; Second, if the resin impregnated Choose properly, it will undergo chemical changes in the medium, but also to wear down; Third, resin impregnated deep enough, when rubbed impregnated layers, wear down. Establishing the sealing of the cooling system, the corrosion of the impregnating resin selection, use of high pressure impregnation, impregnation depth increase is necessary.
Second, oxidation of the graphite ring. In an oxidizing medium, the end face or poor cooling in the dry friction generated when a temperature of 350 ~ 40o ℃ graphite ring can react with oxygen to produce CO, gas, can face becomes rough, or even rupture. Metallic ring, while chemical medium and under stress, will rupture.
Third, polytetrafluoroethylene (F4) corrosion of the sealing ring. F4 filler such as glass fiber, graphite, metal powder to improve its heat resistance, wear resistance. Corrosion fill F4 ring filled mainly refers selective etching, stripping damage or deterioration. For example, in hydrofluoric acid, hot corrosion of glass fiber molecules, so what things should be filled, as the case may be.

Rubber water blocking ring Installation Considerations

Cylinder liner is a water-blocking circle "O" shaped rubber parts, mostly round cross-section, compared with the oil seal, simple structure, neither skeleton, nor self-tightening spring, relying on its own flexibility and rubber elasticity closed . If improperly installed, will make a lot of water jacket cooling water infiltrated the crankcase, causing oil deterioration, lubrication quality deterioration, increased engine wear of the moving parts, and even Burnt axle and other major faults, so when installing water blocking ring should note the following:
(1) If the water blocking ring seal tank too small or too cylinder, the water blocking ring into the seal groove for liner could not certain height above the curved surface, at this time, can be added at the bottom of the seal groove Apply one layer of asbestos rope, coated with water-resistant calcium-based grease, then blocking water trap seal into the groove, and then the body bore cylinder pressure on people.
(2) If the water blocking ring seal tank liner is too thick or too shallow, water blocking ring into the curved face up after too much time not only liner installation difficulties, but also squeeze squeeze even rotten bad rubber seal liner, rubber seal emery cloth evenly polished until it is loaded seal security seal labels tank after projection height appropriate date. Then grease the surface of the rubber ring can be pressed into the cylinder body bore.
(3) If uneven thickness or water blocking ring seal tank shades, rubber ring mounted on the cylinder liner protrusion height after coloring, you should carefully check the rubber ring problem, or seal tank problems, will be deposited problematic parts replaced.
(4) into the cylinder in the rubber blocking water trap seal tank before the rubber ring and meter seals tank should be cleaned, and in the installation into the dirt to avoid impurities. After the rubber ring mounted on the cylinder, carefully check whether there twisting muddy off slot and so on. Liner is installed, you should carefully remove the cylinder upper and lower bearing hole Korea on the dirt, and the next order of hole surface coated with oil, then slowly put pressure on people bearing hole liner.