Common faults of pressure reducing valve

Common faults of pressure reducing valve
Common fault 1    valve straight
cause:
1. The valve disc spring fails or breaks
2. The piston is stuck below the highest position of the piston sleeve
3. The valve disc rod or ejector rod is stuck in a certain position in the guide sleeve, so that the valve disc is in an open state
4. The sealing surface and the sealing surface of the pulse valve are damaged or there is foreign matter between the sealing surfaces
5. The pulse valve leaks or its valve disc rod is stuck at a certain position in the valve seat hole, so that the pulse valve is in an open state; the piston is always under pressure, the valve disc cannot be closed, and the medium is straight through
6. The small passage from the back cavity of the valve to the diaphragm is blocked, so that the valve cannot be closed
7. The air bag control line is blocked or damaged, and the inflation valve leaks
8. Diaphragm, membrane damage or leakage from surrounding seals

Prevention and exclusion methods

1. Regular inspection and replacement
2. Regularly cleaned and repaired, assembled correctly
3. Regularly cleaned and repaired, assembled correctly
4. Regular maintenance, set filter in front of the valve
5. Regular cleaning and inspection, the control channel should have a filter, the filter should be in good condition
6. Set filter and drain pipe before valve, clean and check regularly
7. Regular maintenance. The controlled medium should be clean and the pipeline should be unobstructed
8. Regular replacement, the static sealing surface is flat, the flange bolts are tight and uniform

Common fault 2    valve is blocked

cause:
1. The piston is stuck in the highest position due to damage, foreign matter, rust, etc., and cannot move down, and the valve disc cannot be opened.
2. The air bag of the air bag type leaks or the pressure in the air bag is too low
3. The small passage from the front chamber of the valve to the pulse valve, and the small channel from the pulse valve to the piston is blocked.
4. The adjustment spring is slack or invalid, and the diaphragm and film cannot be displaced, so that the valve disc cannot be opened
Prevention and exclusion methods
1. Regular cleaning and repair, the assembled piston mechanism should be correct
2. Regular replacement, control medium pressure should be normal
3. The channel should have a filter, and the filter should be in good condition
4. Regularly check and replace the spring

Common fault 3     pressure adjustment is not allowed

cause:
1. Spring fatigue
2. The piston seal is not tight
3. The rigidity of the adjustment spring is too large, causing the pressure behind the valve to be unstable
4. Diaphragm and film fatigue
5. The moving parts in the valve are worn, and the normal operation of the valve is blocked

Prevention and exclusion methods
1. Regular inspection and replacement
2. Carefully check before assembly, assembly should be correct, regular maintenance
3. Select the adjustment spring with appropriate stiffness
4. Regular replacement
5. Regular maintenance. Assembly should be correct, filter should be set before valve