- Pay attention to the check valve inspection test
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Firstly disassemble and check the wear condition of the sealing surface of the valve core and the valve seat. If the sealing surface is seriously worn, according to the specific situation, the direct light knife is used to eliminate the defect or the hard alloy layer is deposited on the sealing surface and then the light knife is processed; secondly, The sealing surface of the valve core and the valve seat are relatively ground, so that the sealing lines of the two can be completely fitted; finally, the valve parts are loaded back and then subjected to the tightness test and the hydraulic pressure test, wherein the tightness test requires no valve port. Any of the leaks, and the hydraulic pressure test is the same as the gate valve, according to the valve nominally at 1.5 times for 15 minutes.
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