Pressure test method of safety valve

① The strength test of safety valve is the same as that of other valves. When testing the lower part of the valve body, the pressure is introduced from the I = I end, and the sealing surface is closed; When testing the upper part of the valve body and the valve cover, the pressure is introduced from the El end, and the other ends are closed. The valve body and cover are qualified if there is no leakage within the specified time.

② Sealing test and constant pressure test, the general use of medium is: steam safety valve with saturated steam as the test medium; The valve for ammonia or other gases uses air as the test medium; Valves for water and other non corrosive liquids use water as the test medium. For some important safety valves, nitrogen is usually used as the test medium.

The sealing test shall be conducted with the nominal pressure value as the test pressure, and the number of times shall not be less than two, and it is qualified if there is no leakage within the specified time. There are two ways to check the leakage: one is to seal the joints of the safety valve, paste the thin paper seal on the El flange with butter, the thin paper bulging is leakage, and the other is qualified; Second, use butter to seal the thin plastic plate or other plates on the lower part of the outlet flange, fill water to seal the valve disc, and check that the water does not bubble as qualified. The number of constant pressure and reseating pressure tests of the safety valve shall not be less than 3 times, and it is qualified if it meets the requirements. See GB / T 12242 – 1989 performance test methods for safety valves for various performance tests of safety valves

water control valve


Post time: Apr-26-2021

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