fault is a relief valve leakage. The main reason is: ( 1) core and valve seat interface is not tight; ( 2) core and valve seat surface dirt; ( 3) Stem skew. Failure is the relief valve pressure is not open to the regulations. The main reason is that, 1) 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 constant pressure position, with the limit of screw fastening. Three is the pressure relief valve without fault. The main reason is that, 1) Spring loaded safety valve adjustment of the spring pressure is not enough, the spring failure or lack of elasticity, should be reset or replace the relief valve; ( 2) Lever type relief Industrial Valves weight to move forward, constant pressure hammer will be moved to the original position, with the limit of screw fastening

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