(1) Impurities are stuck on the sealing surface, and debris is deposited at the bottom of the valve or between the valve flap and the valve seat;
(2) The stem thread is rusted and the valve cannot be rotated;
(3) The sealing surface of the valve is damaged, causing leakage of the medium;
(4) The valve stem and the valve disc are not well connected, so that the valve disc and the valve seat are not in close contact with each other.
The valve is not tightly handled:
First, there are impurities stuck to the valve sealing surface
Sometimes the valve is suddenly closed, and there may be impurities stuck between the sealing surfaces of the valve. At this time, the force is forcibly closed. The valve should be slightly opened, and then try to close it. Try it again and again, generally it can be eliminated. Otherwise, it should be For inspection, the quality of the media should be kept clean.
Second, the stem thread rust
For valves that are normally open, when the valve is accidentally closed, the valve stem thread has rusted, and the valve may not be tight. In this case, the valve can be repeatedly switched and closed, and the bottom of the valve body is struck with a small hammer, so that the valve can be closed and the valve can be repaired without grinding.
Third, the valve sealing surface is destroyed
For the case where trying to switch multiple times is still not tight, the sealing surface is damaged and should be repaired; or the corrosion, the grain scratches in the medium, etc., damage the sealing surface and should be repaired.
