The Industrial Valves is in the fluid system, is used to control the direction of the fluid, pressure, flow of the device, is to make the piping and equipment within the medium ( Liquid, gas, powder) Flow or stop and can control the flow of the device. Whether use the new valve, or use after repair of the valve, must test test before installation. pressure testing, refers to the body strength test. Try leakage, refers to the leak test on sealing surface, the two test is a major check the performance of the Industrial Valves. Important valve test medium, generally is the normal temperature water, can use kerosene. The constant pressure relief valve test, can use nitrogen gas, the more stable and can be replaced with air or steam. For the diaphragm valve, using air as a test. A, valve test pressure nominal pressure from 0. 4Mpa- 32 mpa, these common pressure valves, valve strength test pressure for the nominal pressure of 1. 5 times. The valve seal test pressure is equal to the nominal pressure of 1. 1 times. Second, the test method of the valve pressure testing of leakage, on the test bench. The structure of valve test bench, test rig on which there is a pressure parts, here is a line connected with hydraulic test pump. After the valve pressure, hydraulic test pump work, from the hydraulic test pump pressure gauge, can read the valve under pressure. Pressure water filling valve, valve to air in a net. Testing the upper pressure plate, a vent, with a small open and close the valve. Air net logo is, vent out all of them are in the water. After close the vent, began to step up. Booster process slowly, not sharp. After reaching specified pressure, keep 3 minutes, pressure is not qualified. leakage test try three steps: 1, open the valve channel of water ( Or kerosene) Full of valve chamber, and pressure booster to the strength test requirements, check valve, valve cover, gasket, packing with and without leakage. 2, closing valves, pressure on one side of the valve to the nominal pressure, on the other side to check with and without leakage. 3, the valve upside down, on the contrary side.
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