is a kind of relief valve by the import of static pressure on automatic pressure protection device, it is one of the most important safety accessories for pressure vessel, its function is: when the container pressure exceeds a certain value, depending on the medium itself pressure automatically open the valve, quick discharge amount of medium. When the pressure inside the container to the allowable values, valve automatically shut down again, the container pressure allows was always lower than the upper limit, automatically to prevent possible accidents due to overpressure, so the relief Industrial Valves is also known as the final protection device of pressure vessel. The relief valve common failures and causes of 【 The relief valve leakage 】 ( 1) core and valve seat interface is not tight; ( 2) core and valve seat surface dirt; ( 3) Stem skew. The relief valve to stress are not open, 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.

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have three basic components.
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