Valve failure is mainly due to the design, manufacture, selection or improper use. If not eliminate these failures, it will affect the efficiency and life of the valve, can't even play a role in security. Common faults and eliminate as follows:
(1) leakage. In the device under normal operating pressure, valve flap and valve seat sealing surface between the degree of leakage of more than allowed. The reasons are: the valve and valve seat sealing surface between the dirt. Can be used to enhance the wrench to open the valve several times, the dirt washed out; sealing surface damage. According to the degree of injury, by grinding or polishing methods after turning to repair; stem bending, tilting or deflection lever and fulcrum, so that spool and the valve flap transposition. Should be re-assembled or replace the spring decrease or loss of elasticity. Should be taken to replace the spring, to adjust the opening pressure etc..
(2) less than the required opening pressure. Mainly is the constant pressure are not allowed; spring stretch down the aging. Tighten the screws should be properly adjusted or replace the spring.
(3) to the required pressure is not open. The reason for this situation is the constant pressure are not allowed. Should re-adjust the amount of compression springs or weights of the position; valve and valve seat. Should be regular manual release or discharge test of safety valve; lever-type safety valve lever is stuck or the hammer is moved. Should be re-adjusted leverage campaign freely and to hammer position.
(4) exhaust pressure continues to rise. This is mainly because the safety valve discharge selected Xiaoping equipment safety discharge, should be the appropriate choice of the safety valve stem center line; not positive or corrosion of the spring, the valve can not open to a certain height, the stem should be re-assembled or replace the spring; exhaust pipe section is not enough, should be taken to meet the safety area of the exhaust emissions tube.
(5) after the valve does not discharge the back seat. This is mainly spring bending stem, valve installation position is not correct or stuck due. Should be re-assembled.
(6) valve frequency hopping or vibration. Mainly due to stiffness of the spring too. Should use the appropriate spring stiffness; adjustment ring to adjust properly, the pressure back seat is too high. Should re-adjust the position of adjusting ring; discharge pipe resistance is too large, resulting in excessive emissions of back pressure. Should reduce the discharge pipe resistance
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