Pneumatic cut-off valve how to strength test and leak test?

Pneumatic cut-off valve how to strength test and leak test? A: the strength of the pneumatic cut-off valve as in figure 5 - test and leak test 13 the valve test bench. Test, way up high to try test pressure, pressure should be within the prescribed duration, pressure should remain the same, no leakage phenomenon for qualified. ( 1) Strength test of pneumatic cut-off valve strength test as shown in figure 5 - 14. Before the test, the valve should be net of air in the cavity. Test will shut a slightly open, and the valve passage end wall, the introduction of water from the other side. Experiment with by-pass pipe valves, bypass valve should be opened. When pneumatic cut-off valve strength test, the test pressure should conform to the relevant provisions of the test pressure pipe and accessories. Steam and non corrosive gas valve, the valve disc shall be separately tested before assembly. （ 2) Leak test of water, steam and compressed air with pneumatic cut-off valve and leak test with water as the test medium; Ammonia system in all kinds of valve, should with compressed air as a medium for leak test. Leak test of the test pressure for the nominal pressure of valve parts. As shown in figure 5 - pneumatic cut-off valve leak test method 15. Test, close the valve, medium introduced by channel side, at the other end to check its rigor. If fruit is gate valve, both ends into respectively for the above experiments, figure 5 - or use 15 b method, so that only need to do a test. Bonding surface of valve body and valve stem and packing part of the leak test, should be in close under the condition of open, channel closed.