Pressure test valve seal leakage
Whether to use the new valve, or use the repaired valve, pressure test the installation before leak testing.
Valve pressure test, referring to the body strength test. Leak testing, referring to the strict test of sealing surface, the two main performance test is a check valve.
Test medium, typically room temperature water, the valve can be important to use kerosene. Safety valve set pressure test, use the more stable nitrogen gas, steam or air can also be replaced. For the diaphragm, the use of air for testing.
1, valve test pressure
Nominal pressure from 0.4Mpa-32Mpa, the common pressure valves, valve pressure strength test for nominal pressure of 1.5 times.
Valve sealing test pressure equal to 1.1 times the nominal pressure.
2, valve test method
Pressure test valve leakage test, the test bench. The structure of the valve test stand, test stand above a compression parts, here are a connected with the test pump through the pipeline. Compress the valve after the pressure test pump work, from the test pump pressure gauge, you can read out the number of pressure valves. Sufficient water pressure test valve, air valve arrangement to net. Department of pressure plate test stand, a row of holes, with a small valve opening and closing. Sign of the net emission of air is vent out all the water.
Close the vent, it begins to boost. Step process to slow and not sharp. After the required pressure, for 3 minutes, the pressure change in compliance.
Pressure test valve leak test three steps:
1, open the valve channel, water (or kerosene) is full of valve chamber and the pressure boost to the strength test requirements, check valve, valve covers, gaskets, fill any leaks.
2, closed the valve path to the nominal pressure at the valve side of the pressure, from the other side to check for leaks.
3, reversed the valve, test the opposite side.