Valve pressure test includes strength test and air tightness test. Strength test is the test of bearing capacity of valve body material. Air tightness test is to check the sealing surface of disc and seat, gasket and packing of bonnet and valve body.
1. Valve strength and sealing test requirements:
Strength test: for the valve with nominal pressure less than or equal to 42MPa, the strength test pressure is 1.5 times of the nominal pressure; when the valve is under the test pressure, the test time is 5min. The valve shall be free of leakage, leakage and crack.
2. Air tightness test: the air tightness test pressure of the valve (except butterfly valve, check valve, bottom valve and stop valve) shall be equal to the nominal pressure of the valve. When the working pressure can be determined, the test can also be carried out with 1.25 times of the working pressure, and under the test pressure, check whether the sealing surface of the valve disc leaks. For water cast iron gate valve and water cast copper gate valve with nominal pressure less than or equal to 2.5MPa, slight leakage is allowed, and the leakage is not allowed to exceed the value specified in the attached table.
2. The strength test and tightness test of medium valve are generally conducted with pure water. For light petroleum products with working medium or petroleum distillation products with temperature higher than 120 ℃, it is generally used for strength test and kerosene tightness test (leakage test).
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