Safety valve common breakdown and elimination method
Common faults are:
(1) the discharge valve flap back seat
This is spring bent valve stem, valve flap installation due to malposition or stuck. Should be reassembled.
In the equipment working under pressure, valve flap and valve seat leakage in sealing between the occurrence exceeded the allowed level of. The reason: between valve and valve seat sealing surface dirt. Use enhance the wrench opening times of the valve, put the dirt away, sealing surface damage. According to the degree of injury, after grinding or turning the grinding method of repair; bent, tilt or lever and Fulcrum oblique stem, valve core and valve position. Should be reassembled or replaced spring elasticity decrease or loss of elasticity. Replacement spring, again to be taken measures such as adjusting the opening pressure.
(3) to the required pressure does not turn on
The reason for this is the constant pressure caused no. Should adjust the amount of compression of the spring or weight; valve disc and seat stuck. Regular manual gas valve or the water test lever-type safety valve lever is jammed or the weight being moved. Weight should adjust the position and the lever movement with ease.
(4) the exhaust back pressure continues to rise
This is mainly because the selection of safety discharge of small devices with safety valve displacement, should again choose appropriate safety valve stem rust line is not straight or spring, valve flap cannot be opened to the height, should reassemble the valve stem or the replacement spring exhaust pipe cut enough, should take the conformity with the safety area of the exhaust pipe.
(5) the valve chatter or vibration
Mainly because of the spring is too large. Should instead use the appropriate stiffness spring adjusting ring adjustment, return pressure is too high. Should adjust the adjusting ring position; discharge piping resistance too large, causing excessive exhaust back pressure. Lower discharge pipe resistance.
(6) to the required pressure to open
Primarily no; the spring decline in ageing elastic. Should tighten the adjustment screw or replacement springs.