There may be a few reasons why a piston valve cannot close in place:
OneExcessive friction:
When the piston valve is closed, friction is created between the plunger and the valve body. If there is too much friction, the plunger will not be able to close completely in place. Possible reasons include the gap between the plunger and the valve body is too small, and the surface roughness of the friction surface does not meet the requirements.
IIPlunger spring failure:
Piston valves are usually equipped with springs to ensure tightness when the plunger is closed. If the plunger spring fails, the plunger will not close in place. The causes of spring failure may be breakage, deformation, insufficient spring force, etc.
IIIDamaged plunger seal surface:
If the sealing surface of the plunger is damaged, the plunger will not be able to close completely in place. Possible causes are seal face wear, corrosion, scratches, etc.
FourthPiston valve structure problems:
Problems such as unreasonable design and machining accuracy of the plunger valve, improper installation, etc., may cause the plunger to fail to close in place.
In conclusion, the reason why the piston valve is not closed properly may be related to factors such as friction, plunger spring, plunger sealing surface, and the structure of the plunger valve. When solving a problem, it needs to be carefully examined and analyzed to find out the specific cause and take appropriate measures to fix it.
Fujian Detersen valve***