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Maintenance Method of Positive and Reverse Action of Pneumatic Control Valve


Release time:

2021-06-21

When the two valves are bypassed each other, the pneumatic regulating valve will not be closed due to faults, so the water supply will not be stopped. Because the two regulating valve circuits have their own functions, if any fault occurs along the way, the normal operation of the water supply will be affected. If the power failure of the instrument occurs, the whole instrument system will generally be powered off, there is a situation where two regulating valves have no signal pressure together, and other pneumatic regulating valve conditions can also make the regulating valve have no signal pressure. Therefore, the water supply regulating valve may be fully closed due to problems, thus causing the pneumatic regulating valve to fail to operate normally.

Maintenance Method of Positive and Reverse Action of Pneumatic Control Valve

Pneumatic control valveWhat are the positive and negative effects:.
1. When the two valves are bypassed each other, the pneumatic regulating valve will not be closed due to faults, so the water supply will not be stopped. Because the two regulating valve circuits have their own functions, if any fault occurs along the way, the normal operation of the water supply will be affected. If the power failure of the instrument occurs, the whole instrument system will generally be powered off, there is a situation where two regulating valves have no signal pressure together, and other pneumatic regulating valve conditions can also make the regulating valve have no signal pressure. Therefore, the water supply regulating valve may be fully closed due to problems, thus causing the pneumatic regulating valve to fail to operate normally.
2. The replacement of the water feed valve with an air shut-off valve can prevent the suspension of water feed. However, the detection of the two valves should also be considered. The other valve can be used for water feed. If this valve of the pneumatic control valve is air-open, it will still cause the suspension of water feed when problems occur during operation. If the valve is replaced with air shut-off, there will still be potential accidents.
Electric control valve.
Pneumatic control valve is one of the pneumatic valves, which is the same as other pneumatic valves, is compressed air as the power source, the effect of pneumatic control valve is to adjust and control the flow of media in the pipeline.
In the modern automation control system, pneumatic control valve plays a very important effect, in order to avoid the pneumatic control valve presents the problem, we have to regularly on the control valve for maintenance.
1, the valve cavity for high pressure differential or corrosive media occasions of pneumatic control valve, the inner wall of the control valve is vulnerable to the impact of the medium and corrosion, so to check its pressure and corrosion resistance.
2. The valve seat mainly checks the thread of the valve seat and the fixed valve seat, whether the wear condition of the valve seat and the inner surface of the thread are corroded to make the valve seat loose.
3. The valve core of the valve core is severely eroded by the medium in all parts. If the pneumatic control valve is used in high-pressure occasions, the demand focuses on the maintenance of the valve core. As the valve core will have cavitation, the wear will become more severe.
4. Check whether the 0-type sealing ring has aging, deterioration and other conditions.