Under normal circumstances, if the valve is not tight, you should first check if the valve is closed. If there is still a leak that cannot be sealed after it has been closed, check the sealing surface again. Some valve seals are detachable and can be removed for grinding and tested again. If it is still not tight, 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 the occurrence of working conditions and other problems.
The reasons for the lack of strict door are as follows:
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 destroyed, causing leakage of the medium;
4. The valve stem is not well connected to the valve flap, 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 opened slightly larger, and then try to close it. Try it repeatedly, generally it can be eliminated. Otherwise, it should be Check again. The quality of the media should also 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
In the case where it is tried to close the switch many times, the sealing surface is damaged, or the corrosion, the grain scratches in the medium, etc. damage the sealing surface, and this situation should be reported for repair.
Fourth, the valve stem and the valve flap are not connected well.
In this case, it is necessary to lubricate the valve stem and the stem nut to ensure flexible valve switching. It is necessary to have a formal maintenance plan to strengthen the maintenance of the valve.