Spring loaded safety valves of the common faults and reasons

Failure is a safety valve leakage. The main reason is: ( 1) The valve core and valve seat interface is not tight; ( 2) The valve core and valve seat interface with dirt; ( 3) The valve rod deflection. Fault 2 when pressure safety valve to open it. The main reason is that, 1) The valve core and valve seat stick, can do manual exhaust test to rule out; ( 2) Spring loaded safety valve adjustment of the spring pressure is too big, should be readjusted; ( 3) Moving back lever type safety valve of a heavy hammer, hammer should be moved to the original position of the constant pressure, with limit screw fastening. Three is the pressure safety valve without fault. The main reason is that, 1) Spring type safety valve adjustment of the spring pressure is not enough, the spring failure or lack of elasticity, should be reset or change the safety valve; ( 2) Lever type safety valve weight to move forward, constant pressure hammer will be moved to the original position, with the limit of screw fastening