Pneumatic valve gasket causes of leakage and prevent elimination method

Pneumatic valve operation process, is also the process of inspection. Pneumatic valve, high temperature when the temperature rise to more than 200 ℃, the bolt elongation, heated to pneumatic valve sealing parts outside sealing ability, the need to 'tight' heat of bolt, when hot tight, unfavorable in pneumatic valve seated position. To avoid pneumatic valve peak of death, after opening. 2. The season of air temperature is below 0 ℃, pneumatic valve of steam and water, attention should be paid to eliminate the condensate and water, so as to avoid frost crack of pneumatic valve. For water cannot be ruled out pneumatic valves and discontinuous working pneumatic valve insulation work should be paid attention to. 3. The packing gland should not be too tight, the pneumatic valve stem flexible operation shall prevail. The better the idea that gland pressure tight is wrong, the pressure of tight will accelerate the abrasion of pneumatic valve stem, increase the operating torque. 4. In operation through the sounds, smells, see, touch the discovered anomalies, the operator should carefully analyze the reason, to solve their own, should be promptly eliminate, need a repairman, oneself don't barely make do, lest delay time to repair. 5. Operators should have special logs, or book, pay attention to all kinds of pneumatic valve operation, especially some important pneumatic valves, pneumatic valves and special high temperature and high pressure pneumatic valve, including pneumatic valve actuator, recorded the pneumatic valve failure and its reason, the processing method, replacement of parts, such as the materials to the operator itself, repair personnel, as well as manufacturing companies, are very important. Establish special log, clear responsibility, advantageous to strengthen the management.

1。 Gasket causes of leakage:

( 1) Gasket selection is wrong, not medium corrosion resistance, resistance to high pressure or vacuum, the use of high temperature and low humidity

( 2) Operation is not smooth, cause the pneumatic valve pressure, temperature fluctuates up and down, especially the temperature fluctuations.

( 3) Gasket compression force is not enough or no preloaded gap junction.

( 4) Improper gasket assembly, uneven stress.

( 5) Static sealing surface processing quality, surface rough, uneven, transverse defects such as scratches, sealing pair are parallel.

( 6) Static sealing surface and the gasket is not clean, mixed with foreign bodies, etc.

2。 The prevention and elimination method:

( 1) Should be in accordance with the working condition correctly select gasket material and plastic type.

( 2) Careful adjustment, stable. Operation.

( 3) Should be symmetrical and uniform tightening bolts, torque wrenches should be used when necessary, should comply with the requirements, the prestressing force is too small or too large. Flange and threaded joints should be preloaded gap.

( 4) Gasket for assembly should meet, force uniform, gaskets are not allowed to overlap and using double gasket.

( 5) Static sealing surface corrosion and damage, the processing quality is not high, should be repaired, grinding, the examination of the color, make the static sealing surface in compliance.

( 6) Cleaning should be paid attention to when installing gasket, sealing surface using kerosene cleaning, gaskets should not fall to the ground.