Butterfly valve manufacturer to share the valve pressure test method

Butterfly valve manufacturer to share the valve pressure test method

Different valves have different methods of pressure testing, today my company to talk about the valve pressure test method.

　　1. Globe valve pressure test method

　　Globe valve strength test, usually put the assembled valve in the pressure test frame, open the valve, inject the medium to the specified value, check whether the valve body and valve cover sweating and leakage. Can also be a single piece of strength test. The sealing test is only done for globe valves. Test the valve stem of the globe valve into a vertical state, the valve is open, the medium from the bottom of the valve flap end of the introduction to the specified value, check the packing and gaskets; to be qualified to close the valve flap, open the other end to check whether there is leakage. If the valve strength and sealing test should be done, you can first do the strength test, and then depressurize to the sealing test value, check the packing and gaskets; and then close the valve flap, open the outlet end to check whether the sealing surface leakage.

　　2. Ball valve pressure test method

　　Pneumatic ball valve strength test should be carried out in the ball half open state.

　　① Floating ball valve sealing test: the valve in a half-open state, one end of the introduction of test media, the other end is closed; will turn the ball a few times, the valve is closed when the closed end of the closed end of the inspection, while checking the packing and gasket at the sealing performance, there shall be no leakage phenomenon. Then introduce the test medium from the other end, repeat the above test.

　　② fixed ball valve sealing test: before the test will be unloaded ball rotation several times, fixed ball valves in the closed state, from one end of the introduction of the test medium to the specified value; with a pressure gauge to check the introduction of the end of the sealing performance, the use of the pressure gauge accuracy of 0.5 ~ 1 level, the range of the test pressure of 1.6 times. In the specified time, there is no pressure drop phenomenon is qualified; and then from the other end of the introduction of test media, repeat the above test. Then, the valve in a half-open state, closed at both ends, the inner cavity is full of media, under the test pressure to check the packing and gasket, there shall be no leakage.

　　③ Three-way ball valves should be in each position for sealing test.

　　3. Butterfly valve pressure test method

　　The strength test of pneumatic butterfly valve is the same as the globe valve. Butterfly valve sealing performance test should be introduced from the media flow end of the test medium, the butterfly should be opened, the other end closed, injected pressure to the specified value; check packing and other seals without leakage, close the butterfly, open the other end, check the butterfly sealing without leakage is qualified. Butterfly valve as a flow control may not do sealing performance test.

　　4. Diaphragm valve pressure test method

　　Diaphragm valve strength test from either end of the introduction of media, open the valve flap, the other end is closed, the test pressure rises to the specified value, see the valve body and valve cover no leakage is qualified. Then depressurize to the sealing test pressure, close the valve flap, open the other end for inspection, no leakage is qualified.

　　5. Check valve pressure test method

　　Check valve test state: lift check valve valve flap axis is in a position perpendicular to the horizontal; rotary check valve channel axis and flap axis is in a position approximately parallel to the horizontal line.

　　Strength test, from the inlet end of the introduction of test media to the specified value, the other end is closed to see the valve body and valve cover without leakage is qualified.