The ball valve pressure test method

1、The ball valve pressure test method

　　Pneumatic ball valve strength test should be carried out in the half-open state of the sphere.

　　① floating ball valve sealing test: the valve in a half-open state, one end of the introduction of the test medium, the other end closed; the ball will be turned several times, the valve is closed when the closed end of the open check, while checking the packing and gasket sealing performance, there shall be no leakage. Then introduce the test medium from the other end and repeat the above test.

　　② fixed ball valve sealing test: before the test will be idle ball rotation several times, fixed ball valve in a closed state, from one end of the introduction of the test medium to the specified value; use the pressure gauge to check the sealing performance of the introduction end, the use of pressure gauge accuracy 0.5 ~ 1 level, the range of the test pressure 1.5 times. In the specified time, no pressure drop phenomenon for qualified; and then introduce the test medium from the other end, repeat the above test. Then, the valve in a half-open state, both ends closed, the cavity is filled with media, check the packing and gasket at the test pressure, there shall be no leakage.

　　③ Three-way ball valve should be tested in each position for tightness.