Plastic security seal to make it clear in the application of structural differences

Wire mesh skeleton plastic seals (PE) composite pipe is spread around the pipe and other entangled in high-strength steel wire seals to strengthen the skeleton , its internal and external high- density polyethylene matrix composite formed by the continuation of the new pipe extrusion .Accory plastic seal Wire mesh skeleton plastic seals (PE) composite pipe Masquerade life experience will make large diameter plastic pipe with poor bearing capacity of hard to get resolved. These features make the product in the municipal water supply, out of line in the pharmaceutical , oil and chemical industry has a broad and imaginative Pan Pan Bo Bo Bo Pan unrestrained unrestrained dominate growth prospects .
Due to the structure of disagreement , wire mesh skeleton plastic seals (PE) composite pipe in pressure , was significantly higher than the pressure capacity PVC , PE, PP-R pipe , the thickness of the product suffered the same pressure needed less than pure plastic construction plastic pipe , pipe era dominate the scene image image stress cracking resistance , resistance to rapid crack growth , creep resistance are given advance the reliability of the long dominate also be protected. . Accory wire seals It saved a brilliant performance pressure steel pipe , plastic pipe and there wonderful pique hope is willing to defend and easy to lay, craft reliable , long life and other specialty dominate .

How to distinguish between security seals Specifications

Why do some nylon cable ties Specifications 2.5 * 1003.5 * 2004.8 * 300 and some how there is 3 * 1004 * 2005 * 300 different?
Best answer : precisely 2.5 * 1003.5 * 2004.8 * 300 ( with decimal point ) is the actual size , which are the actual width 2.5MM, 3.5MM, 4.8MM. The 3 * 1004 * 2005 * 300 is the nominal size , is just a name for 3,4,5 does not represent the actual width of the case : the actual width 2.0MM 100MM length can be called 3 * 100 , the length of the actual width 2.5MM 100MM can also be called 3 * 100
Nylon cable ties acid , corrosion, good insulation nylon rods , and not aging , bear strong. Can be used in the minus 40 to 90 degrees in the environment . Standard color is white, in addition to UV black , other colors are welcome to order.
Fixed lines are widely used in the product and bundling TV , computer and other internal wiring , appliances, lighting, electrical , electronic toys, machinery and equipment, oil pipeline fixed , fixed gear vessels nylon cable lines , bike vehicle packaging or bundled with other objects , can also be used in agriculture, horticulture, handicrafts and other bundled items , but also for Europe and other countries in a variety of supermarkets, hypermarkets and other uses. The product has a lashing fast , good insulation , self-locking ban solid , easy to use features . Standard color is gray (white ) , the other with black and other special color , welcome to order. Complete specifications, special specifications can be customized dance gear . 3-4 days after receipt of an order to delivery.
Gold and silver tie
This product is acid-resistant , corrosion resistance, good insulation , not aging, bear strong. Can be used in the minus 40 to 90 degrees in the environment . Standard color is white, in addition to UV black , other colors are welcome to order. Can be used for gifts , food, decor package . Complete specifications, special specifications can be customized . 3-4 days after receiving the order.
PET non-core cable ties acceleration gear ( food grade green )
Use safety grade material safer, more environmentally friendly. PET material is more environmentally friendly , easy to cause surface damage to other products
Application: Commonly used in AC, DC wires, plugs , cables packaging and high-grade precision over the bundling of electrical leads . Compliance with EU environmental testing standards. Size options: complete specifications, special specifications can be customized .
Production of various rope, ribbon, decoration with gear pump , packaging paper flowers, pull flowers, ribbons, ties, gift tape, Hong Kong garland, Christmas ribbon , pp ribbon, ribbons, plastic ribbons, jewelry ribbons , printing tape, ribbon flowers , PET ties and other packaging materials, products used , garment accessories , bag belt, shoelaces decorations, gifts cassette , crafts with and so on. Ribbons , adapted to clothing, electronics , ribbon , crafts, toys, accessories , jewelry industry , printing and packaging, supplies and other daily production acceleration gear types accessories, Rated temperature : 105 ℃, rated voltage : 300 ∨.
PET environmental core ties
PE green mini-band : also called iron bar lines, plastic coated wire , magic belt , the product has good flexibility , but there are acid and alkali corrosion , oxidation, rust , and other functions not hurt the skin , the product has passed "SGS" environmental certification, in line with EU requirements and other countries accory container security seals. Mainly used for various electrical appliances, wire bundling , gardens, gardening gear download strapping , strapping toys, crafts, food bags , wires, cables , connectors and other items.
White , transparent color , red, green , blue, yellow. There are two kinds of ordinary PVC and non-toxic . The so-called non-toxic , in fact, low lead , low cadmium, CSTC line with EU standards .
Are: double-sided, single-sided, round, oval special specifications can be customized , cutting different lengths .
VO grade flame retardant cable ties
Material meets the requirements of the gear UL94V0 band Nylon 66 ( Natural), also available with ROHS material . Temperature can be 130 ℃, and difficult to burn at a high temperature conditions.
High impact resistant cold ties
Material meets UL94V2 nylon 66 ( Natural), also available with ROHS material . And toughness, and in arctic and high temperature conditions is not easy to brittle fracture .
Micropyle ties
Materials meet UL approved NYLON66 ( character ) , fire rating 94V-2. The power cord can be used to tie dance gear bar , you can then release reused.
Live button Ties
UL94V2 quality meets the requirements of nylon 66, are also available meet ROHS, you can loosen repeatedly. Color is white ( natural color ) , black, other colors can be customized.
Mark Brand Ties
Material meets UL94V2 nylon 66 , are also available meet ROHS, tie head with a blank tag cards, available in any writing above the required mark . Color is white ( natural color gear download )
Bolt nylon cable ties
Material meets UL94V2 nylon 66 , are also available with ROHS material . By the insertion head into the pre-drilled mounting holes until the lock , and then tie the wires.
High temperature nylon cable ties ( cable ties , cable tie ) :
Material UL approved Nylon 66 , fire rating 94V-0, acid , corrosion resistance, good insulation accory stainless steel cable ties, not aging, bear strong. Products are certified by UL , SGS environmental protection material proof nylon cable ties , to high temperature above 150 degrees.
Fixed head nylon cable ties

Material used YL approved Nylon 66 , fire rating 94V-2, acid , corrosion resistance, good insulation , not aging, bear strong.

Terminal blocks security seals performance determines its role

In fact, the terminal called terminal blocks . So let us from the terminal 's basic common sense to understand .

1, what the distribution box ground terminal block for?

A: The ground terminal is a dedicated ground terminals , our electricity is now a three-phase four-wire system . Neutral and ground separated. Ground is generally connected to the outlet of the ground line to protect the electrical safety !

2 , and under what circumstances the use of terminal blocks ?

A: The wire connections between different devices , you need to terminal blocks , some plug-in ( module ) also requires the terminal block.

3 , the electrical cabinet when you need terminal blocks ?

A: Take a mounting unit for the sector, and out of the unit will need to wire the terminal block.

4 , terminal blocks Type Type of 4EN What does it mean ?

Answer : 4EN said contact area 4 mm2 .

5 , terminal blocks are what ah ?

A: The easy wiring ; such as when installing the distribution cabinet , table lights or doors on every terminal count . Check line convenient ; easy to measure when a failure occurs tamper evident tapes . Node expansion ; same line number node expansion.

6 , how to choose the design of the substation transformer and terminal block ?

A: The transformer capacity to be calculated too big too small will not work ; terminal block for distance is generally not less than 350mm, the current loop must be current test terminal OT wiring .

Terminal blocks for easy wire connections and applications , it is actually some sealed inside an insulating plastic sheet metal , wire can be inserted into the hole at each end , for tightening or loosening screws , such as two wires , sometimes need to be connected , and sometimes you need to disconnect , this thing can use the terminal to connect them , and you can disconnect at any time , without having to weld them together or intertwined , it is quick and easy. And is suitable for a large number of interconnected wires in the power industry have a special terminal block tamper seal labels, terminal box , above all terminal blocks , single and double , current, voltage , ordinary, can be broken and so on. A crimp in order to ensure reliable contact with the area , and to ensure a sufficient current through .

How to maintain a seal with spring cleaning compartments

Went to the spring, the flowers of the season , after a winter break , a car friends at the same time enjoy the warmth of spring , you might want hikers to travel and enjoy the beauty of nature pull tight straps; You may be busy working day , shuttling between the bustling markets and offices .... but anyway , you do not forget to care about your car , it cheer , good for you.

Spring car, the first is to do body sealing . This is because the spring sand dust weather cause more to deal with such bad weather , the owner ahead of the best window sealing tape carefully check whether there is aging, degumming, cracking , if necessary, replace the sealing strip about aging , enhanced interior seal to prevent sand entering . Such treatment is not only able to deal with dust weather , when the weather gets hot , but also help to strengthen the effect of air conditioning .

Owners need to be reminded that, should try to use the air conditioning outer loop mode, to avoid a lot of dust into the car. Because the spring sandstorm rampant , but after the wind, whether it is the center console , shift lever , seat , floor and so covered with dust, the air inside the car also becomes more turbid, in large sandstorm season, the compartment is also often deposited a layer of dust , and you should pay attention to timely clean. As the car accessories such as door seals ,metal seals etc. are mostly plastic and rubber materials, cleaning must use special cleaning agents and clean soft cloth , not inside and outside the mix ; using professional cleaning agent console , doors and other parts for cleaning and disinfection .

Mechanical seals are the primary method of modern shaft seal

Modern shaft seal mechanical seal is the main method, though use of it is not easy to achieve completely leak, but the reach of tiny, it is perfectly acceptable amount of leakage is entirely possible. However, the operation of the pump, but often embarrassing situation, then the mechanical seal failure because what is it?
1, the mechanical seal material selection inappropriate. Mechanical seal material and the transmission medium does not match. In operation, the sealing element will soon be corrosion, dissolution or wear, thus losing the sealing capability. Therefore, according to the nature of the transmission medium and the choice of the mechanical seal material is to ensure its sealing function and the normal life of the prerequisites.
2, the mechanical seal flush condition does not meet the design requirements. In conveying easy to crystallize or fine particles of the medium, there must be a certain pressure and a certain flow of fluid to wash, or their crystals or particles will accelerate the sealing wear and affect the sealing of worn automatic compensation leak. Therefore, according to the nature of the transmission medium not only to configure the appropriate flushing lines, but also to install a monitoring and regulation instruments and devices to ensure that fluid pressure and flow to meet the design requirements, in order to maintain the normal operation of the mechanical black cable ties, which is often overlooked by users.
3, each of the mechanical seal can withstand the pressure is limited, due to the seal chamber pressure measurement are not allowed, resulting in the seal chamber pressure exceeds the mechanical seal can withstand the pressure of the leak, is a common sealing One reason for failure.
4, the mechanical seal operating temperature can not exceed the specified value. In the design of a cooling circuit, often due to insufficient flow of the cooling medium leaving the cooling effect is reduced; without the cooling circuit design, the seal cavity often as harbored in the air and cause mechanical seal dry friction condition. In both cases, the movement of the mechanical seal sealing temperature is too high and accelerated wear, resulting in seal failure.
5, the use of a single spring mechanical seals ignored when spring pump rotor rotation direction and the direction of rotation correct combination also occurs. Or design without instructions or assembly negligence, failed to do so because of the rotation of the rotor mechanical seal leaving but on the contrary increase the spring force, resulting in the ring and stationary ring friction pairs formed insufficient pressure leak.
6, bearing severe wear or damage, so that axial movement of the shaft produce severe, but also one of the reasons mechanical seal leakage. With the scientific and technological development, new marker cable ties and sealing materials, emerging forms, which is bound to the pump seal technology have a direct impact and promoted. Long life, zero leakage pump products in a growing number of occasions to get promotion and application.

Hydraulic equipment damaged by the impact of seals

Mechanical processing industry, hydraulic transmission is widely used, such as lathes and other types of semi-automatic hydraulic transmission . These machines during use , such as the impact of frequent , reptiles and other faults , diagnostic repair, often in the hydraulic control components ( such as various types of pumps, valves ) can not find the cause of the malfunction , resulting in maintenance trouble. The final such failure or normally found on the actuator causes the cylinder piston sealing element due to severe wear . Such phenomena especially "O" ring seal see more .
Example 1: a CE7120 hydraulic copying lathe, turret profiling occurs in the work cited by the sword turn longitudinal feed line cutting die cutter , resulting knife fight , scrap living phenomenon frequently, the machine does not work.
Inspection and Maintenance : Check no fault of the hydraulic control components , maintenance work one o'clock into blind spots. Overhauling vertical turret tank, found that the piston seal "O" ring seal has been polished cylindrical , cylindrical piston also found substandard size requirements ( genus machine tool manufacturing reasons ) , the diameter direction is less than standard size 0.8mm, piston and cylinder body clearance large, causing vertical cylinder two chambers communicate channeling oil . Maintenance, and replacement of the piston passing "O" -ring after the die cutter machine troubleshooting. Analysis of the reasons cited in the profiling tool holder in place of the instantaneous line of the sword , the whole holder to receive a momentum F ', the force is decomposed F'1 a horizontal force acting on the cylinder piston rod longitudinal direction , at the same time , the solenoid valve 34E1-25B work turned vertical cylinder rod chamber pressure oil chamber connected rodless return oil control valve , the piston rod chamber by the force F by the two partially completed , one for F'1, the other is F1 = A1P1, where A1 is rodless chamber force area , then F = F'1 + F1. Under normal circumstances , the piston under the action of the force F rod chamber began to move , as incompressible hydraulic oil , hydraulic oil pressure rodless abrupt increase cavity to form a back pressure piston , the piston control valve according to the force balance it is set to go steady speed knife . The moment due % F'1 role in longitudinal cylinder chamber pressure P2 will be greater than P1. In practice, the two-chamber cylinder gap channeling due to the P2> P1 moments, hydraulic fluid from the high pressure zone with rod chamber rod chamber to the low pressure area flow trends , liquidity , once produced , P2 reduced , P1 rises , F1 increase large , unbalanced force piston , the piston driven turret quickly moves to the rod chamber . And moments later, the end result of profiling tool slide downward acting on the piston in the cylinder longitudinal horizontal thrust F'1 disappear on their own fast-moving piston end , take the knife stabilized turret , Fixed Length plastic seal red knife phenomenon ends.
Example 2: a CB3463-1 semi-automatic programmable hexagon turret lathes, during use , the emergence of the turret feed rate can not adjust the failure phenomenon , globe valve 2 is closed there is still crawling, pediment , and has been to bottom of the tank to stop the machine does not work properly .
Inspection and Maintenance : Inspect all hydraulic control components , especially the governor components have not found any problems. Replace some of the control valve , the failure persists . After dismantling the cylinder after the discovery piston "O" ring seal badly worn , so that the two chambers of hydraulic oil cylinder channeling each year. Analysis of the reasons , because "O" -ring wear, cylinder rod chamber and the rod chamber gap increases interoperability, when closing valve control valve 3 or 2:00 , it means cutting off the cylinder rod chamber oil return road. Theoretically , the pressure oil into the cylinder rod chamber when the piston is formed without a force F , the piston rod chamber to move the trend, as the cylinder rod chamber back to the oil off the rapid formation of the oil cavity back pressure , so that the force balance across the piston stationary , F a = F no time , no fluid pressure chamber due to the piston force different size and different, that is, P a > P no .
In practice, a gap is formed due to the two chambers communicate with each cylinder , the cylinder chamber with pressure oil from the high pressure region to the low flow area trends , mobile one generation,security seals a lower chamber pressure P , P without elevated ends of the thrust acting on the piston F No > F Yes, loss of balance piston rod chamber to move to find a new balance . And so forth, the piston has been moved to an external force barrier to stop. The phenomenon of the maintenance work to the machine brought great impact , replace the cylinder piston "O" ring seal , the machine fault elimination , running back to normal.

Industrial pump mechanical seal failure and these reasons

Vibration is too large
Mechanical seals vibration is too large , resulting in loss of seal. But the reasons for larger vibration mechanical seal mechanical seal itself is often not the cause , the other parts of the pump is the source of vibration , such as shaft design is unreasonable ,container seals processing reasons, lack of precision bearings , couplings parallelism poor, radial force and other reasons .
Pump cavitation causes
Since the unit and the pump inlet system operation unreasonable cavitation performance is not good, the high speed of the pump , the pump inlet localized cavitation , cavitation occurs, the water will bubble one hand, it will impact the mechanical seal faces an outer surface , so that the surface damage ; hand side anastomosis ring movement causes a flow membrane also contains bubbles can form a stable flow of film, resulting in movement of the ring fit surface friction, the mechanical seal device is damaged .
Lack of precision machining
Machining accuracy is not enough , there are many reasons , some precision mechanical seal itself is not enough, the reason for this is easy to arouse people's attention , but also easy to find. But sometimes the other components of the pump is not precision , the reason for this is not likely to cause people 's attention . For example: shaft , bushings ,security seals  pump, seal chamber to increase accuracy is not enough other reasons . The presence of these reasons, the sealing effect of the mechanical seal is very unfavorable .

Gasket leaks cause analysis

The gasket leakage :
General gasket leaks , there are four forms: interface leak , leak penetration , diffusion leaks, damage leak.
Penetration leak: soft gasket material because the material is mostly fiber, easy to dip appropriate media , in particular pressure . tie wraps Due to capillary phenomenon, the medium will penetrate into the low pressure side to form infiltration.
Interface Leak : The interface is not as gasket compression flange surface finish combined with improper flange deformation etc will leak in the sealed interface . For interface World leakage , the use of padded material can be clamped against the flange surface .
Destruction Leakage: sealing parts relatively poor working conditions , thermal deformation, often affected by vibration, shock , improper installation , fastening force is too large , used repeatedly , deformation , stress concentration, fatigue strength and damage than the material aging , deterioration etc will cause damage leak. This leakage causes the greatest impact hazard is also large , to strengthen prevention.
Diffusion Leakage: poor concentration , driven by the media or by sealing the gap sealing material produced by mass transfer and capillary leak . Diffusion is the result of molecular motion , and not one-way. Minimal pressure or vacuum in a sealed state , or sealed nitrogen, high security seal hydrogen and other permeable substances, as well as highly toxic , radioactive substances should pay special attention penetration and proliferation of two kinds of leaks.

New seal ring fragmentation causes and prevention measures

mechanical security seals seal ring fragmentation is a common phenomenon of early failure . Graphite stationary ring main is broken off , ceramic , tungsten carbide ring is mainly Seals cracks and deformation . Graphite ring broken off , a serious leak sealing , sealing medium pressure greater than the pressure can not be guaranteed . Although ring crack , causing leakage increased, but in most cases, but also to maintain operation . Resulting graphite ring broken off for many reasons , mainly the following .
( 1 ) Rubber seals or PTFE V-ring and graphite ring and stationary ring seat fit too tight , graphite by squeezing , under the dynamic fragmentation .
( 2 ) Install the seal chamber and pump in shock when heavy or pump seal chamber heavily skewed .
( 3 ) the swing axis and the string exceeds the specified value.
( 4 ) seal water interruption friction dry friction, high temperature , sealing ring thermal cracking , but suddenly sent to seal water , violent contraction of the seal ring fragmentation .
Ring crack main reasons are:
( 1 ) carbide ring , there is a greater stress on moving ring operation, in force , under the combined effects of internal forces cracks . These cracks are diverging radially dense fine cracks.
( 2 ) Temperature: non-metallic materials for the seal ring ( such as ceramic , WC), due to thermal conduction is not good , the ring is very uneven temperature distribution , even in normal conditions, the temperature may reach several Baidu , the temperature difference due to the presence and, thus, thermal stress caused by thermal deformation . When the thermal stress reaches a certain level , resulting in stress exceeds the ultimate strength of the material . At this time, the sealing ring on brittle materials tend to produce surface cracking , thereby enabling the sealing surface of the friction and wear and tear and failure. Due to thermal deformation of the sealing surface will fit clearance distortion, thus increasing the leakage .
Ring face with carbide , due to the thermal expansion coefficients of these materials are small , and the substrate materials, the thermal expansion coefficient difference between the larger ( stainless steel carbide thermal expansion coefficient than 3 to 4 times ) , so when the sealing temperature l exceeds a certain value , it will cause surfacing carbide seal ring deformation or cracks.
Solving dynamic and static bad fragmentation and deformation effective measures , in addition to strictly control the quality of spare parts processing , careful installation and maintenance , enhance operational management , the guarantee can be fully cable seals face lubrication and cooling are important measures. However, in practice, not any time to ensure adequate lubrication and cooling , seal water pressure fluctuations , disruption and misuse of workers , will cause the seal to lose sufficient lubrication and cooling.

Cycloid gear pump industry applications extended

Because nothing like cycloid gear involute gears meshing in the center distance separability , tooth profile curve equation is complex and engaging ordinary cycloid gear pump is a multi- point contact . Gang Here, cycloid gear machining high precision , small processing errors might prevent the assembly, or uneven loads .security tie Prior to the 1980s of last century by means of design calculations and processing technical limitations , cycloid gear pump application subject to certain restrictions. With the increased level of processing technology , especially the development of numerical control technology , cycloid gear machining accuracy gradually improved , the cost becomes lower , cycloid pump renewed attention .

Its application range with gradually expanded from general industrial extended to the field of micro-mechanical hydraulic systems and bio- engineering . With more teeth difference cycloid gear pump and the emergence of modern design and manufacturing technology development , research and cycloid gear pump by domestic and foreign scholars and producers attention. Recently, there are many foreign companies producing such a gear pump . It is understood that a large number of imports from abroad, air compressors, chillers, oxygen compressors, expanders , and a large number of chemical raw material conveyors often appear on the cycloid gear pump , especially in the chemical industry for delivering high-viscosity liquids on the device .trailer seals China also has many companies began producing teeth difference cycloid pump , but all in imitation of similar products abroad , mainly in order to meet the need for equipment maintenance .

Beverage bottle child may drink into the container sealed proposal

News Playback frequency exposure safety issues bottled beverages
As temperatures gradually warming , bottled drinks ushered in the year of the sales season. At the same time , some information about the safety of bottled beverages reports but can often be seen .
Ms. Wang Hefei Parkson supermarket bought in Jasmine Tea Master of bottled beverages. Open only to find that the cap wall covered with black mold substances . After Ms. Wang found a manufacturer, factory explanation is " previously encountered such a problem may be caused by moisture on the supermarket warehouse ."
In recent years , with regard to beverage bottle moldy , breeding eggs , frequent reports of excessive bacteria . These problems involve many well-known brands , showing not the case. The brand is also more for such quality issues attributed to warehousing, transportation and other circulation . Well, we almost daily consumption of bottled drinks, they are not fully sealed bottle in the end it ? Please enter the living laboratory period , the facts to give you the answer.
Sample: 4 bottles of mineral water , label 1,2,3,4 , 1,2 for the same brand of mineral water, which is internally threaded cap double parallel lines, 3,4 for the same brand of mineral water , which internal thread for the screw cap double lines ; gentian violet
Experimental conditions: the fully sealed and then tighten unscrew bottle of mineral water upside down into the gentian violet solution
Experimental Target : gentian violet solution will soak into the inside of the cap
Experimental Procedure
1 The test samples 1,3 unscrew , pour a glass of water , then tighten. Open a bottle of drinking too mimic the situation .
2 gentian violet take about 5 ml was poured into water , the water level height is about 3 cm , can be completely off caps.
3 respectively 1,2 inverted water bottle into the gentian violet solution and let stand for 5 minutes . After removing the bottle with a paper towel and put up dry.
4 Take 3,4 mineral water bottles, repeat step 3.
7 Unscrew guinea pigs 3,4 . Among them, the whole of the 4th sealed bottle caps innermost colored spots appear below the threads 3 , on the outermost whorl coloring water droplets. The 4th bottle mouth with colored spots under the thread , the bottle at no obvious staining . And before the experiment was then tighten the screw to open the 3rd bottle , barrier seals staining slightly above the 4th bottle , the bottle at no obvious staining .
6 Unscrew guinea pigs 1,2 , which is the 2nd bottle sealed inside found no shading . And before the experiment was unscrew and tighten No. 1 bottle , the cap edge coloring inside of the case . Bottles at the bottle and bottle screw were no shading .
5 4 bottles of mineral water to be dried and observed . Bottle of mineral water bottle and cap of about 1 cm were staining .
The 4th bottle caps with colored water droplets inside
Experimental results : closed bottle of mineral water infiltration staining solution is still possible , but it will not penetrate the bottle at .
● Expert Interpretation
Secretary-General of the International Food Packaging Association , professor of environmental experts said threaded portion of beverage bottles only play the role of reinforcement , but not confined, " really play a role in the sealed bottle on a prominent cushion , tightening the cap while pressing close to the bottle, sealing function . "
Introduction, vendors can make through ultrasound and heat shrinkable plastic shrink technology , to enhance or replace the mold bottle seal. But for cost reasons , most companies will not use these technologies , while the domestic beverage bottle hygiene standards at a blank spiral also enable manufacturers failed to give sufficient attention.
Said that as the threaded mouth is not sealed ,security seals in the filling , warehousing, transportation and other aspects of secondary contamination may exist , it is recommended to drink bottled beverages , do not directly touch the bottle mouth . " The use of straw may still exist secondary pollution , advised consumers to pour the beverage in the container and then drink ."

Seal pneumatic valve structure and working principle

Lever hoist structure
Lever hoist structure . When the valve is closed, the spindle and the lever with the taper pin fastened around the point o counterclockwise rotation , lever driven off with perforated disc ab, by a compression spring to promote the disc fixed fulcrum on n , with the spindle lever rotates. When the butterfly plate upper b and valve sealing surface to seal all contact . Open the process is reversed . In the opening and closing process , the relative sliding sealing small , reducing the relative wear . In the off state for the axial pressure seal , to change the traditional external compression seal.
By force type actuator rod
By force type actuator rod , the piston in the air under pressure to the right, sliding rod drive arm in the housing , the connecting rod affects rocker clockwise , the output torque. The rod and rocker length (h) the same is equal to the output housing groove cardiac center . Case groove walls subjected to lateral thrust f, p affects rocker rotating component , according to the force analysis shows that:
p = q / cosαα = sin-1 (1-sinβ)
m Twist = phcos (90-α-β) = qhsin (α + β) / cos (α + β)
From the above equation , β angle decreases , α angle increases , m torque value increases. When β = 0 °, α = 90 ° (the valve is closed) , the maximum output torque of drive means ,marker cable ties and in the opening and closing process of the torque is small. This feature is exactly on the curve inclusive of valve operating torque curve , to meet the butterfly valve in the closed or open state seal required torque .
Flat sealing structure
Past pneumatic valve seal pair commonly used spherical sealing , the sealing pressure is radial compression force , the sealing amount of interference can not be adjusted , depending on the sealing performance of the sealing material amount of interference , therefore, the design of the sealing material selected the amount of interference is very important . At work, in particular in zeolite pre-purification process, the switching valve is operated in the range of 10 ~ 200 ℃ , when using the rubber seals , rubber, linear expansion coefficient is large , by the temperature change is large , the amount of interference is difficult to accurately OK. If interference capacity, not only increase the friction , and often appear to "bite edge" and "turn tongue" phenomenon, so seal failure , a small amount of interference appeared leak. Even if the amount of interference reasonable choice , and this valve switching frequently over time due to wear and after the operation will fail . If the use of non-rubber sealing materials, according to information known at present , their elastic deformation is small, the radial seal interference is difficult to control, manufacturing complexity , high cost. While the rubber seal materials, changing the temperature , the temperature of the rubber seal and cause premature aging of the fatigue damage , for large air separation unit is equipped with large-diameter pneumatic butterfly valve, replace the seals will be very difficult.
Since the movement of the valve plate using leveraged institutions , when the valve plate is closed , the valve plate sealing surface contact with the valve seat to become subsequently lever cam mechanism equivalent , if the spindle continues to rotate , then translate the valve plate forward to continue to achieve the balance of forces with working medium pressure, but also to achieve self-sealing , ensure the sealing reliability. When the wear of the sealing surface , the seal also has an automatic wear compensation characteristics , thereby extending the service life.
New sealing pneumatic valve is used flat metal seal structure , the valve as a non- consumable welding of stainless steel alloy, copper alloy seat seal ring with cobalt alloy or stainless steel welding generations , nylon zip ties they are highly resistant to corrosion and abrasion resistance , temperature range, between -40 ~ 300 ℃ in long-term use , so much more life than rubber seal .

Reaction kettle mechanical seal structure and working principle

Reactor mechanical seal comprises a spring loading device , ring, stationary ring and auxiliary seals and other four parts.
Reactor mechanical seal generally have four face :
A reactor with static ring seal between the stationary ring seat is static sealing the reactor , generally produced with flexible secondary seal to prevent leakage.
2 reactor stationary ring seal between the seat and the device is static sealing the reactor , can be produced with ordinary gasket seal.
3 reactor ring and shaft (sleeve ) between the metal seal , this is a relatively stationary seal , usually 0 -ring to seal .
These three are all static sealing , can produce measures to prevent leakage.
4 reactor stationary ring and the relative rotation between the sealing ring , belonging to dynamic seal, is to rely on a spring loading device and media pressure on the relative rotation . Static ring and ring contact surface between the ( end ) to generate a suitable clamping force ,bolt seal so that the two smooth, flat end face snug fit between the end face of the fluid while maintaining a very thin layer to achieve the purpose of sealing .

VRLA batteries four conditions of a hermetic seal

Well known in the battery manufacturing process , tight sealing is to prevent the battery from the loss of moisture during storage and decrease in capacity , to prevent the green copper cap and ensure that no water in the use of the important measures grout . Tight vehicle cargo seal with the battery discharge level of performance , leak-proof performance and storage performance solidarity . Sealing the battery to prevent intrusion of oxygen in the air inside the battery , accelerated corrosion of zinc . Therefore , in order to ensure the quality of the battery , it is necessary to strengthen seal.
When they meet the following four conditions , sealed VRLA batteries can be achieved .
1 ) Negative grid with no antimony lead-calcium alloy to improve the cathode overpotential , which is to improve gas precipitation threshold voltage , according to estimates using lead-calcium alloy than the low antimony alloy high 200mv precipitation gases. Inhibiting the precipitation of hydrogen , with a certain internal pressure . And there is a very strong corrosion resistance.
2 ) using a special one-way valve , the internal pressure of the battery to maintain a certain balance , and to suppress the outside air (O2) from entering the battery negative grid corrosion , trailer seals the valve opening pressure of 18-23Kpa, valve closing pressure of not less 8Kpa, and there filter acid tablets to maintain a certain electrolyte concentration .
3) The porosity of more than 90% ultra-fine glass fiber separator , a certain amount of adsorption of the electrolyte , to lean solution design , and sufficient gas passage , the gas can internally complex .
4) The negative plate active material 10% excess , of oxygen is sufficient to precipitate the composite positive electrode , the negative electrode reaction is always in charge , to prevent hydrogen and salinization .

Sealing performance is to solve the key problem of transformer oil leakage

In recent years , through the main transformer and auxiliary transformer Oil Leak processing , continuous improvement , summarize prevention measures , transformer oil leakage rate is greatly reduced for the safe operation of the transformer to provide a guarantee for the enterprise , social, and users get economic efficiency.
1 , select the material good seals
Transformer maintenance and handling leakage should be selected high temperature, excellent oil resistant metal cable ties. Domestic transformer industry, the most commonly used seal material is nitrile rubber , oil resistance depends mainly on its acrylonitrile content of nitrile rubber , acrylonitrile content is higher, the better oil resistance , hardness , the more easily deformed. Generally Shore hardness should be selected between 70 to 80 nitrile rubber . Identification oil resistant gasket , the general aging test should be done and the gasket and compatibility testing of transformer oil , to be immersed in the hot oil 120 ℃ 168h, and measuring its weight , volume and rate of change of hardness , select its little deformation , standards-compliant security seal.
2, choose high-quality butterfly
Select ZF80 vacuum eccentric butterfly valve . Compared with the ordinary valve , vacuum butterfly valve in the mechanical strength , surface finish has been greatly improved, and that it also has one of the biggest advantage is that the transformer flange interface uses a double-sealed , so put an end to transformer oil leakage at the interface problem .
3 , the use of welding plugging
For the left to the transformer due to casting porosity, trachoma , weld , solder joint appearance of Weld , Desoldering , crack , the available welding for plugging. In the blocking should identify leaks before welding , smaller leaks will drain directly Welded little dead ; leak should be filled with the larger asbestos rope or metal filler , and then surfacing in four weeks , and then using a small electrode high-current fast arc welding .

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.

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.

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.

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.

Silicone sealant five selected features

Requires sealant has a low modulus, high displacement capability, better with wood properties, freely scalable, best to use 50LM (50 low modulus magnitude) silicone sealant. The displacement capacity of plus or minus 50%. Skylights with plastic also requires transparency is good, nice, especially in high-rise and high-rise curtain wall, Oita panes of glass curtain wall, using laminated insulating glass curtain wall, seismic fortification area 9 degrees on the wall, even in these types of situations combination, but also need to use high-performance structural silicone sealant. Silicone sealant tensile strength and elongation at break are high, with the same bonding width can withstand greater loads.

Most silicone sealants are named according to the site of application, when used also by the selection of the appropriate parts of silicone sealant.

1, building curtain panel seams. Building walls between the panel and the panel joints need glue to fill, then you should use silicone weather sealant. It needs to withstand the wind load, dynamic load, the deformation of the substrate caused by thermal expansion and contraction displacement, while in the case of tension or compression, adhesion will not be destroyed, but also has good elastic recovery rate, the displacement of the panel disappears, it can return to its original state. Refer to the standard "glass curtain wall joint sealants."

2, light top position. Skylights due to their own weight load, snow load, wind load, asymmetric load and deflection caused by thermal expansion material large and complex, not only horizontal displacement, and shear displacement. Particularly the use of a polycarbonate plate, due to its high coefficient of thermal expansion and contraction, the glass 67 times.
3, structural silicone sealant assembly parts. And its supporting structure in the curtain wall panel sealant used between the need to withstand a variety of loads, and to ensure long-term adhesion, not fall off, you must meet national mandatory standards "structural silicone sealant" (GB16776) requirements .
4, the area between the doors and windows. Colored aluminum windows and doors aluminum and glass to use the gap between room temperature curable sealant fill. Fully cured, integrally formed between the glass and aluminum.
5, stone panel area. Stone panel components must be used exclusively stone silicone sealant. Because the stone itself is a porous material, susceptible to contamination, and contamination is difficult to remove. General sealants containing plasticizers and other non-reactive low molecular weight substances, internal migration from the gum to the stone house, the stone surface of the oil and dust, causing the stone pollution. This adhesive is divided into two categories. First stone sealing glue for security seals caulk between the stone plates.

The second is hanging stone with plastic, stone and metal hook for the bond between. Past used stone hanging rigid class epoxy glue, building vibration, they will pass the stress stone panel, stone easily be shattered. In the past with polyacrylates, neoprene, polyurethane filling, adhesive or easily damaged by external force, or harmful volatile gases. Silicone sealant no such ills, can play a long tamper seals, waterproof effect.