Hydraulic Valves Factory Introduces Pressure Testing Methods With Pneumatic Valves

Hydraulic Valves Factory introduces pressure testing methods with pneumatic valves:

1. Pressure test method of globe valve:
For the strength test of the globe valve, the assembled valve is usually placed in the pressure test frame, the valve disc is opened, the medium is injected to the specified value, and the valve body and valve cover are checked for sweat and leakage. The strength test can also be carried out on a single piece. The tightness test is only for the shut-off valve. During the test, the valve stem of the globe valve is in a vertical state, the valve disc is opened, the medium is introduced to the specified value from the bottom end of the valve disc, and the packing and gasket are checked. After passing the test, close the valve flap and open the other end to check for leakage. If the strength and tightness test of the valve is to be done, the strength test can be done first, then the pressure is reduced to the specified value of the tightness test, and the packing and gasket are checked; then the valve disc is closed, and the outlet end is opened to check whether the sealing surface is leaking.

2. Pressure test method of butterfly valve:
The strength test of the pneumatic butterfly valve is the same as that of the globe valve. In the sealing performance test of the butterfly valve, the test medium should be introduced from the low end of the medium, the butterfly plate should be opened, the other end should be closed, and the injection pressure should reach the specified value; after checking that there is no leakage at the packing and other seals, close the butterfly plate, open the other end, and check the butterfly valve. No leakage at the plate seal is qualified. The butterfly valve used for regulating flow may not be tested for sealing performance test.

3. Pressure test method of diaphragm valve:
Diaphragm valve strength test: The medium is introduced from either end, the valve flap is opened, and the other end is closed. After the test pressure rises to the specified value, it is qualified to see that the valve body and bonnet have no leakage. Then reduce the pressure to the tightness test pressure, close the valve disc, and open the other end for inspection, if there is no leakage, it is qualified.

4. Pressure test method of check valve:
Check valve test state: the axis of the lift check valve disc is in a position perpendicular to the horizontal; the axis of the swing check valve channel and the disc axis is in a position approximately parallel to the horizontal line. During the strength test, the test medium is introduced from the inlet end to the specified value, and the other end is closed, and it is qualified to see that the valve body and valve cover have no leakage. The tightness test introduces the test medium from the outlet end, and at the inlet end check the sealing surface, no leakage at the packing and gasket is qualified.