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Causes Of Stem Deformation
- Aug 21, 2018 -

1.Area 

The stem is usually broken at the bottom of its upper and lower threads, as the area is relatively small and there is a tendency for the corresponding strength concentration and overshoot.

2. Break when opened

Usually the moment the stem breaks is the moment it opens.This is mainly because the gate has not been removed from the seat and the stem has broken at the root of the upper or lower threads and is generally considered to be the gate that is stuck, which is not the whole reason or the most important.

3. The body

Abnormal temperature and pressure drop occur when the middle cavity of the valve body is closed, which means that the fluid pressure in the middle cavity between the upper and lower sealing surfaces is much higher than the upstream pressure after the valve is closed.Here's why:

(1) inflation

(2) closed