The main reason for the failure of the safety valve is caused by design, manufacture, selection or improper use. If these failures are not promptly eliminated, it will affect the effectiveness and life of the valve, or even can not play a security role. Common faults and elimination methods are as follows:

1, leak

At the normal working pressure of the equipment, leakage between the flap and the sealing surface of the valve seat exceeds the allowable level. The reason is: disc and valve seat sealing surface between the dirt. You can use the lifting wrench to open the valve several times, the dirt rushed to the seal surface damage. Should be based on the degree of damage, grinding or turning after grinding method to be repaired; stem bending, tilting or lever and fulcrum skew, so that the valve spool and valve flap dislocation. Should be reassembled or replaced; spring elasticity is reduced or loss of elasticity. Should be replaced by spring, re-adjust the opening pressure and other measures.

2, to the provisions of the pressure does not open

The reason for this is that constant pressure is not allowed. Should be re-adjust the amount of spring compression or hammer position; disc and valve seat stick. The safety valve should be manually operated or defrosted on a regular basis; the lever of the lever type safety valve is jammed or the hammer is moved. The hammer position should be reoriented and the lever can be moved freely.

3, less than the required pressure to open

Mainly constant pressure is not allowed; spring aging elastic decline. Adjust the screw or replace the spring properly.

4, after the exhaust pressure continues to rise

This is mainly because the safety valve discharge of the selected safety valve equipment should be re-selected the appropriate safety valve; valve stem center line or spring rust, so that the valve can not open to the proper height, should re-install the valve stem Or replace the spring; exhaust pipe cut is not enough, should be taken to meet the safe discharge area of the exhaust pipe.

5, the valve flap frequency or vibration

Mainly due to the stiffness of the spring too. Should be used to adjust the stiffness of the appropriate spring; adjust the adjustment ring improper, so that the pressure back too high. Should adjust the adjustment ring position; discharge pipe resistance is too large, resulting in excessive discharge back pressure. Should reduce the resistance of the discharge pipeline.

6, after the release of the valve is not back seat

This is mainly caused by the spring bending of the stem, the valve flap mounted incorrectly or stuck. Should be reassembled.