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Normal reasons that cause the valves can not close tightly and how to deal with it?
Under normal circumstances, if it is not tightly closed, first check to see if the valve is closed in place. If it has been closed in place, there is still leakage and cannot be sealed, then check the sealing surface. If the vice-sealing pair can be disassembled, then take it out for grinding and test again. Of course, if it is still not closed tightly, then it must be returned to the factory for repair or replacement of the valve, so as not to affect the normal use of the valve and accidents such as working conditions.