How single-seat pneumatic - valve strength test and leak test?

How single-seat pneumatic - valve strength test and leak test? A: single-seat pneumatic - valve strength test and leak test in figure 5 - 13 the valve test bench. Test, way up high to the test pressure, pressure should be within the prescribed duration, pressure should remain the same, no leakage phenomenon for qualified. ( 1) Strength test single-seat pneumatic - 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. Valve strength test of the test pressure shall be in conformity with the relevant provisions of the test pressure of the pipes 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 single-seat pneumatic control valve, 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. Single-seat pneumatic - valve leak test method as shown in figure 5 - 15. Test, close the valve, medium introduced by channel side, at the other end to check its rigor. If it is a gate valve, respectively, both ends into as 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.