Common malfunction of safety valve and elimination method:

(1) The valve is not back seat after discharge. This is mainly caused by the spring bending stem, the disc mounting position is not positive or jammed. should be reassembled.

(2) leakage. Under the normal working pressure of the equipment, the leakage between the disc and the seat sealing surface exceeds the allowable degree. The reasons are: there is a dirt between the disc and the seat sealing surface. The valve can be opened several times using the lifting wrench, and the dirt is washed away; According to the degree of damage, the method of grinding or turning should be used to repair the valve stem bending, tilt or lever and fulcrum deflection, so that spool and disc dislocation. should be reassembled or replaced; spring elasticity decreases or loses elasticity. Should take the replacement spring, readjust the opening pressure and other measures.

(3) Not open to specified pressure. The reason for this situation is that the pressure is not allowed. The compression of the spring or the position of the heavy hammer shall be readjusted; The safety valve should be put on a regular basis for manual gas release or discharge test; lever-type safety valve lever is jammed or heavy hammer is moved. Re-adjust the position of the hammer and make the lever move freely.

(4) After the exhaust pressure continues to rise. This is mainly because of the safety relief valve used in the use of smaller equipment, the appropriate safety valve should be re selected; the valve stem is not normal or the spring rust, so that the disc can not open to the proper height, should be reassembled valve stem or replace the spring, the exhaust pipe is not enough, should take the safe discharge area of the exhaust pipes.

(5) Disc frequency hopping or vibration. Mainly because the spring stiffness is too large. The appropriate stiffness of the spring should be replaced, improper adjustment of the adjustment ring, so that the back seat pressure is too high. The adjustment circle position should be readjusted, and the resistance of the discharge pipeline is too large, resulting in excessive discharge backpressure. Should reduce the discharge pipeline resistance.

(6) Less than the prescribed pressure to open. The main is the fixed pressure is not allowed; Adjust the screw or replace the spring properly.