Mechanical seal failure to take measures to deal with

If the mechanical seal parts fails, you need to replace parts or increase machining precision parts, precision mechanical seals to improve the precision and the pump itself, other components of the mechanical seal is very favorable. In order to improve the sealing effect of the movement of the ring and the friction surface finish roughness higher. Width of the friction surface of the ring movement is not, generally between 2 to 7 mm.
Mechanical seal vibration, heat treatment
If the gap between the sealing ring and the movement of the small chamber, the inner diameter of seal chamber should increase or decrease the outer diameter of rotation, a gap of at least 0.75mm guaranteed. If the friction pair is improper, it is necessary to change the static ring material to temperature, corrosion resistance. This will reduce the mechanical vibration and heat sealed.
Handling mechanical seal leakage
Mechanical seal leakage is due to a variety of causes, we have to deal with specific issues. In order to minimize the amount of leakage, must be strictly in accordance with the technical requirements for the installation of mechanical seal assembly, but also pay attention to the following matters.
(1) assembly to be clean and smooth. Mechanical seal parts, tools, lubricants, wiping material to be very clean. Movement ring seal face use a soft gauze wipe. (2) trimming chamfer rounding. Shaft seal cover, such as chamfers to trim and smooth, rounded shaft and cover related to sanding polish. (3) secondary seal assembly, the auxiliary seal rubber gasoline, kerosene can not be soaked and washed to avoid swelling deformation,bolt security seal premature aging. After the static ring assembly, hand pressed compensation loop, checking is in place, is flexible; elastic snap ring is positioned reliable. Ring is installed, you must ensure that it is flexible shaft axial movement.
Shaft channeling large processing
Rational design of axial force balance device, eliminating axial channeling. To meet this requirement, the multi-stage centrifugal pumps, design options are: balance disc plus axial thrust bearing, the balance disc balance the axial force, the axial thrust bearing on the shaft axial limit.
Adding auxiliary flushing system
Seal chamber sealing medium containing particles, impurities must be flushed, because otherwise the precipitated crystals, particles, deposition of impurities, the mechanical seal spring failure, if the particles entering the friction will cause rapid destruction of the mechanical seal. Therefore, secondary mechanical seal flush system is very important, it can effectively protect the sealing surface, played cooling, lubrication, wash away debris and so on.
Pump vibration treatment measures
In the manufacturing assembly process pump products in strict accordance with the standards and procedures to perform, to eliminate vibration source. Pumps, motors, chassis, piping and other auxiliary equipment on site during on-site installation, to strictly eliminate vibration source.
Studied more than simple mechanical seals on rotating equipment applications and emerging fault,metal seals later encountered mechanical seal failure problems, we must first consider the impact factors of mechanical seals itself, and then also consider some factors outside of the mechanical seal. For example: In analyzing the causes of the accident quality mechanical seal, taking into account the impact on other parts of the pump mechanical seal operation, take measures to continuously improve the mechanical seal effect.

These aspects of mechanical seals how to do these problems

Graphite ring ( or ceramic ) fracture
PTFE o-ring friction is small , stationary ring with snap ring rotation , the contact pin after the break.
Symptoms at the pin groove cracking or destroyed a graphite ring .
Corrective measures making pin sets ; self-locking cable ties using other types of seals or static ring structure.
o-ring overheating
Usually because the heat conduction unfavorable end result .
Symptoms rubber ring hardening and cracking. PTFE blue or black. Near the seal face the worst .
Corrective measures checking seal design ; Check and improve circulation status .
o-ring extrusion
o-ring part is forced through a small gap . Assembly or assembly of components when the force is too large, or the sealing gap is too large .
Symptoms o-ring is cut or torn skin .
Corrective Action Check the assembly method .
o-ring corrosion, swelling
Symptoms inappropriate material selection occurs when swelling , fracture , deformation and other faults.
Corrective measures based on the actual conditions, re-select the material .
Graphite erosion ( element )
When the fluid pressure is too large or contains grinding particles .
Symptoms of flushing fluid inlet is on the element at a erosion pits .
Corrective measures to reduce the fluid pressure ; using hydrocyclones .
Evacuated
System pressure fluctuations or cavitation generated at the seal faces
Symptoms: plastic security seals the dregs at the end round and round Zhoucheng Bo striated , 0 laps extrusion, static ring from the bit .
Corrective Action: change the system operation process , increase the amount of rinse

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 .

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.

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 .

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.

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