Pressure test method of plug valve

① During the strength test of the plug valve, the medium is introduced from one end, the other passages are closed, and the plug is rotated to each fully open working position in turn for the test, and the valve body is qualified if no leakage is found.

② During the sealing test, the straight through cock shall keep the pressure in the cavity equal to that in the channel, rotate the plug to the closed position, check from the other end, and then rotate the plug 180 ° to repeat the above test; the three-way or four-way cock shall keep the pressure in the cavity equal to that in the channel, rotate the plug to the closed position in turn, and the pressure shall be introduced from the right angle end and conducted from the other end at the same time Check.

Before the plug valve test, it is allowed to coat a layer of non acid thin lubricating oil on the sealing surface, and it is qualified if there is no leakage or expanded water drop within the specified time. Plug valve test time can be shorter, generally according to the nominal diameter is 1 ~ 3min.

The plug valve for gas should be tested for air tightness at 1.25 times the working pressure.

Y42X SPRING PISTON PRESSURE REDUCING VALVE


Post time: Apr-20-2021

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