Common valve fault and the elimination of Method

Safety valve failure is mainly due to the design, manufacture, selection or improper use. These failures, if not promptly removed, it will affect valve efficiency and life, not even a security protection. Common faults and eliminate as follows:



(1) leak. 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: valve flap and valve seat sealing surface between the dirt. Wrench can be used to enhance the valve is open several times, the dirt washed out; sealing surface damage. Should be based on degree of injury, using grinding or after grinding method of turning to repair; stem bending, tilt lever with the fulcrum, or skewed, so that spool and the valve flap dislocation. Should be re-assembled or replaced; spring elastic lower or no flexibility. Should be taken to replace the spring, re-adjust the opening pressure of other measures.



(2) to the required pressure is not open. The reason for this result is the constant pressure are not allowed. Should re-adjust the amount of compression spring or a heavy hammer position; valve flap and valve seat stick. Should be placed manually on a regular basis on the safety valve for gas or turn on the water test; lever-type safety valve is stuck or heavy hammer, the lever is moved. Should re-adjust the position of the heavy hammer and to leverage campaign freely.



(3) less than the required pressure to open. Is mainly constant pressure are not allowed; spring decline in the aging stretch. Should be properly tightened screw to adjust or replace spring.



(4) The exhaust back pressure continues to rise. This is mainly due to the use of safety equipment, safety valve to vent emissions Xiaoping contribution, should be re-select the appropriate safety valve; stem rust midline errors or spring, so that valve flap can not be opened to the proper height, should be re-assembled stem or replace the spring; the exhaust pipe cut-off there is not enough, should be taken to comply with the safety area of the exhaust pipe emissions.



(5) The valve flap jump frequency or vibration. Was mainly due to large spring stiffness. Should be replaced by an appropriate spring stiffness; adjustment ring to adjust properly, so that the pressure is too high back seat. Should re-adjust the adjustment ring position; discharge piping resistance is too large, resulting in excessive emissions of back pressure. Should reduce the emission of piping resistance.



(6) The discharge does not return after the flap valve seat. This is mainly spring curved stem, valve installation position is not correct or stuck valve caused. Should be re-assembled. 

  

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