General valves are not tightly closed.

If the valve is not closed strictly, first of all, we should find out where the problem occurs, and then solve the problem according to the corresponding method. There are the following reasons why the valve is not closed strictly:

(1) impurities are stuck on the sealing surface, sundries are deposited at the bottom of the valve or cushioned between the disc and the seat;

(2) the stem thread is rusty and the valve cannot be rotated;

(3) the sealing surface of the valve is destroyed, resulting in leakage of the medium;

(4) the stem and disc are not connected well, so that the disc and seat deviation can not be closely contacted.

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