The strength test of the pneumatic ball valve should be carried out in the half-open state of the ball valve sphere.
Floating ball valve tightness test: Put the valve in a half-open state, introduce the test medium at one end, and close the other end; rotate the ball several times, open the closed end when the valve is in the closed state, and check the sealing performance at the packing and gasket at the same time. There is leakage. Then introduce the test medium from the other end and repeat the above test.
Fixed ball valve tightness test: before the test, rotate the ball without load several times, the fixed ball valve is in the closed state, and the test medium is introduced from one end to the specified value; the pressure gauge is used to check the sealing performance of the inlet end, and the accuracy of the pressure gauge is 0.5～ Level 1, the range is 1.6 times the test pressure. Within the specified time, if there is no decompression phenomenon, it is qualified; then introduce the test medium from the other end, and repeat the above test. Then, put the valve in a half-open state, with both ends closed, and the inner cavity filled with medium. Check the packing and gasket under the test pressure, and there should be no leakage.
The three-way ball valve shall be tested for tightness at various positions.
