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Safety valve common faults and elimination methods
Safety valve installation, due to improper use, often cause many failures. If these failures are not promptly ruled out will affect the safety valve's role and service life. Common failures are: (1) discharge valve does not back seat This is the main spring bent stem, valve installation location is not correct or is stuck caused. Should be reassembled. (2) Leakage Leakage exceeding the allowable level occurs between the valve plate and the sealing surface of the valve under the normal working pressure of the equipment. 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. (3) to the pressure does not open the cause of this situation is due to constant 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. (4) After the exhaust gas pressure continues to rise This is mainly due to the safety valve discharge Xiaoping equipment safety relief should re-select the appropriate safety valve; valve stem neutral or spring rusty, the valve can not be opened to Some height, the valve stem should be reassembled or replace the spring; exhaust pipe cut enough, should be taken to meet the safe exhaust area of ​​the exhaust pipe. (5) Valve flap or vibration is 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. (6) less than the required pressure to open the main fixed pressure is not allowed; spring aging elastic decline. Tighten the adjustment screw should be appropriate or replace the spring. Search Keyword: Safety Valve