Safety valve failure is the main reason for the design, manufacture, selection or use caused by improper. If these failures are not promptly eliminated, it will affect the valve's effectiveness and life expectancy, or even fail to play a safety role. Common failure and treatment are as follows: (1) leakage. In the normal working pressure of the equipment, the valve flap and seat sealing surface occurred more than the allowable degree of leakage. The reasons are: there is dirt between the valve disc and the sealing surface of the valve seat. Use the lift wrench to open the valve a few times and rinse the dirt off; seal surface damage. Should be based on the degree of injury, grinding or turning grinding method to be repaired; stem bending, tilting or lever deflection with the fulcrum, so that the valve core and valve dislocation. Should be reassembled or replaced; spring elasticity is reduced or lost. Should take to replace the spring, re-adjust the opening pressure and other measures. (2) Do not open to the specified pressure. The reason for this situation is the pressure is not allowed. Should re-adjust the amount of spring compression or hammer position; valve flap and seat stick. The safety valve should be deflated or discharged manually on a regular basis; the lever of the lever safety valve is stuck or the weight is moved. The hammer should be readjusted and the lever should be moved freely. (3) less than the prescribed pressure to open. Mainly constant pressure is not allowed; spring aging elastic decline. Tighten the adjustment screw should be appropriate or replace the spring. (4) After the exhaust pressure continues to rise. This is mainly due to the selection of safety valve discharge Xiaoping equipment safety relief should re-select the appropriate safety valve; stem neutral or spring rusty valve so that the valve can not be opened to the proper height, the valve stem should be reassembled Or replace the spring; Exhaust pipe cut enough, should be taken to meet the safety of the exhaust area of ​​the exhaust pipe. (5) Disc does not back seat after discharge. This is mainly the spring bent stem, the disc is not installed properly or stuck. Should be reassembled. (6) Valve flap or vibration. Mainly due to the spring stiffness is too large. Should use the appropriate stiffness of the spring; adjust the adjustment circle inappropriate, so that the back seat pressure is too high. Should adjust the adjustment ring position; exhaust pipe resistance is too large, causing excessive emissions back pressure. Should reduce the discharge pipe resistance.
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