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Safety valve common faults
2015-11-23 by bridge
Safety valve common faults
After the discharge valve does not return to the seat: This is mainly a spring bent stem, valve installation caused by malposition or stuck. It should be re-assembled.
Leakage: Under normal operating pressure equipment, exceed the allowable level of leakage between the valve and valve seat sealing surface. The reasons are: dirt between the valve and valve seat sealing surface. You can use a wrench to open the valve lift several times, rushed to the dirt; sealing surface damage. Should be based on the degree of damage, the use of grinding or turning grinding method to repair; stem bending, tilting or deflection lever and fulcrum, the valve body and the valve flap dislocation. Should be re-fitted or replaced; spring elasticity or loss of elasticity. Should be taken to replace the spring, readjust the opening pressure and other measures.
When a predetermined pressure is not open: The reason for this situation is the constant pressure allowed. Or weights should readjust the position of the spring compression; valves and valve seat sticking. You should regularly make manual bleed valve or drain test; lever-type Pilot Safety Valves lever is stuck or weights to be moved. Hammer should readjust the position of the lever and move freely.
After the discharge pressure continues to rise: this is mainly because the choice of safety discharge valve displacement of less than equipment, should be re-appropriate choice of safety valve; stem rust midline errors or spring, so that the valve can not be opened due to height, should be re-assembled stem or replace the spring; there are not enough cross-section of the exhaust pipe, emissions should be taken to meet the safety area of the exhaust pipe.
Frequency hopping or vibration gas valve: spring stiffness is mainly due to too much. Should use appropriate spring stiffness; adjustment ring to adjust properly, so that the back seat pressure is too high. Should readjust the position of the adjustment ring; discharge piping resistance is too large, resulting in excessive emissions of back pressure. Discharge pipe resistance should be reduced.
Less than the required pressure is on: The main constant pressure allowed; spring stretch down the aging. Tighten the screw should be properly adjust or replace the spring.
After the discharge valve does not return to the seat: This is mainly a spring bent stem, valve installation caused by malposition or stuck. It should be re-assembled.
Leakage: Under normal operating pressure equipment, exceed the allowable level of leakage between the valve and valve seat sealing surface. The reasons are: dirt between the valve and valve seat sealing surface. You can use a wrench to open the valve lift several times, rushed to the dirt; sealing surface damage. Should be based on the degree of damage, the use of grinding or turning grinding method to repair; stem bending, tilting or deflection lever and fulcrum, the valve body and the valve flap dislocation. Should be re-fitted or replaced; spring elasticity or loss of elasticity. Should be taken to replace the spring, readjust the opening pressure and other measures.
When a predetermined pressure is not open: The reason for this situation is the constant pressure allowed. Or weights should readjust the position of the spring compression; valves and valve seat sticking. You should regularly make manual bleed valve or drain test; lever-type Pilot Safety Valves lever is stuck or weights to be moved. Hammer should readjust the position of the lever and move freely.
After the discharge pressure continues to rise: this is mainly because the choice of safety discharge valve displacement of less than equipment, should be re-appropriate choice of safety valve; stem rust midline errors or spring, so that the valve can not be opened due to height, should be re-assembled stem or replace the spring; there are not enough cross-section of the exhaust pipe, emissions should be taken to meet the safety area of the exhaust pipe.
Frequency hopping or vibration gas valve: spring stiffness is mainly due to too much. Should use appropriate spring stiffness; adjustment ring to adjust properly, so that the back seat pressure is too high. Should readjust the position of the adjustment ring; discharge piping resistance is too large, resulting in excessive emissions of back pressure. Discharge pipe resistance should be reduced.
Less than the required pressure is on: The main constant pressure allowed; spring stretch down the aging. Tighten the screw should be properly adjust or replace the spring.
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