Safety valve failure is mainly due to the design, manufacture, or use options due to the inefficiency. These failures if not eliminate, this will affect the efficiency and valve life, can not even play a role in security. Common faults and the elimination of as follows:
1, leakage
In the normal operating pressure equipment, valves and valve seat sealing surface to allow more than between the degree of leakage. The reasons are as follows: valve and valve seat between the sealing surface dirt. Wrench can be used to upgrade several times to open the valve, to the red dirt; sealing surface damage. Should be based on the degree of injury, after turning the use of abrasive or abrasive methods of repair; stem bending, tilt or skew the lever and fulcrum so that with the valve spool position. Should be re-fitted or replaced; spring or flexible to reduce the loss of this flexibility. Should be taken to replace the spring, re-adjusted measures such as opening pressure.
2, to the provisions of the pressure does not open
The reasons for this pressure is not allowed. Should be re-adjustment of the compression spring, or the location of heavy hammer; stuck valve and valve seat. Should be periodically manually release a safety valve for gas or water test; leveraged lever safety valve was stuck or heavy hammer was mobile. Weights should be re-adjusted the location of free movement and leverage.
3, less than the required pressure to open
The main pressure is not allowed; spring decline in the aging stretch. Adjustment screw should be tightened up or replaced the spring.
4, the exhaust pressure continued to rise after
This is mainly because the safety valve selection of safety equipment emission Xiaoping China a big bang, should be the appropriate choice of a safety valve; stem rust midline errors or spring, so that valve can not be opened due to the height of the valve assembly should be re - or replacement of spring; exhaust pipe cut-off there is not enough, should be taken to comply with the safety area of the exhaust pipe emissions.
5, valve or vibration frequency jump
Spring stiffness was mainly due to too much. Should use the appropriate spring stiffness; adjustment ring to adjust properly, so that the pressure is too high back seat. Loop conditioning should be re-adjusted position; discharge pipe resistance is too large, resulting in excessive back pressure emissions. Resistance should be reduced outfall.
6, after the discharge valve seat back
This is mainly a spring winding stem, valve or valve installation position errors caused by stuck. Should be re-assembled
