A butterfly valve generally consists of a body and a disc that can open or close the valve with the rotation of the stem. There may be several reasons why the butterfly valve is not closed tightly:
OneLoose stem:
If the stem is loose or not tightly connected, the disc will not be able to close the valve completely, resulting in a loose shut-off. This can be solved by adjusting the stem fastening nut or replacing the stem seal.
Second, the butterfly plateWear and tear:
After prolonged use, the surface of the butterfly plate may wear out, resulting in the inability to seal completely. At this point, the valve disc can be replaced or repaired.
IIIGasket aging:
The valve gasket may also be deteriorated or damaged, resulting in poor closing. The gasket can be replaced to solve the problem.
FourthForeign body blockage:
If there is a foreign object or dirt inside the valve, it can also cause the valve disc to not close completely. The valve can be cleaned or removed for cleaning.
In summary, a poor butterfly valve closure can be caused by loose stems, worn discs, aging gaskets, or clogged foreign bodies. The problem needs to be overhauled or replaced on a case-by-case basis.
Fujian Detersen valve***