Valves often have some troublesome problems during use, for example, the valve is not closed tightly or tightly. What should I do? Under normal circumstances, if it is not tightly closed, first check to see if the valve is closed in place. If there is still leakage and cannot be sealed after it has been closed in place, then check the sealing surface. If it is 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 maintenance or replacement of the valve to avoid affecting the normal use of the valve and accidents such as working conditions.

If the valve is not closed tightly, you should first find out where the problem is, and then solve it according to the corresponding method. Generally, there are several reasons why the valve is not closed tightly:

(1) There are impurities stuck on the sealing surface, and the impurities are deposited on the bottom of the valve or between the valve clack and the valve seat;
(2) The valve stem thread is rusty and the valve cannot be turned;
(3) The sealing surface of the valve is damaged, causing the medium to leak;
(4) The valve stem and the valve clack are not well connected, so that the valve clack and the valve seat cannot be in close contact.

Treatment method for loose valve closing:

1. There are impurities stuck to the valve sealing surface
   Sometimes the valve is not tightly closed suddenly. It may be that there is an impurity stuck between the sealing surface of the valve. At this time, force should not be used to close the valve. The valve should be opened slightly, and then try to close again. During the inspection, the quality of the medium should be kept clean.

2. the stem thread is rusty
For the valve that is usually open, when it is accidentally closed, because the valve stem thread has rusted, it may not close tightly. In this case, you can repeatedly open and close the valve several times, and at the same time knock the bottom of the valve body with a small hammer, the valve can be closed tightly without grinding and repairing the valve.

3. the valve sealing surface is damaged
If the switch is still not closed tightly after several attempts, the sealing surface has been damaged and should be reported for repair; or if the sealing surface is damaged by corrosion or particle scratches in the medium, it should also be reported for repair.

4. the valve stem and the valve clack are not well connected
Lubricate the valve stem and the valve stem nut frequently to ensure flexible opening and closing of the valve, and a formal maintenance plan is required.