The valve will not open
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I stopped the operation of the unit in order to open the DN300 gate valve, but the handwheel wouldn’t turn. Normally, this valve remains closed and not in use; it is only opened during shutdowns. As shown in the picture, after removing the valve, it appears that something dirty and rusted has blocked the valve stem, preventing the valve from opening. It's caused by something else. Also, what methods can be used in the future to prevent valves from failing to open? Please discuss, extra points available
What medium is it traveling on? There’s nothing to do if too much sediment accumulates; add a filter in front
There is too much dirt in the medium. Regular sewage discharge
Severe internal scaling has caused the moving parts to get stuck
There is corrosion; investigate the cause by checking the pipeline, and verify whether the filter screen has been cleaned
Which components of a valve are referred to as moving parts?
1. The valve features a wedge-shaped gate; its advantage is that once the gate is no longer in contact with the valve seat at its lowest point, the torque required to open the valve is reduced. 2. It is inevitable for impurities to accumulate inside valves that have been closed for long periods, and the physical properties of these accumulated substances affect the torque needed to open the valve. 3. Since the medium and the atmospheric environment can be corrosive, users should provide appropriate protection for the threaded part of the valve stem and apply lubricant regularly
Regular maintenance on a regular basis is very important. . .
The deposition of medium on the sealing surface caused the valve to fail to open! To prevent the deposition of medium particles at the seal, a protective gas can be used to shield the sealing surface.
What part of the valve does the sealing surface refer to?