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Common Fault Analysis and Daily Maintenance of Pneumatic Ball Valve


Release time:

2021-07-15

Common Fault Analysis and Daily Maintenance of Pneumatic Ball Valve

Pneumatic ball valveDuring the installation and protection of pneumatic ball valves, the following points should be paid attention:
1. check the air source treatment device, check whether the filter, pressure reducing valve and oil mist device are normal, and investigate whether the pressure is 3-8kg;
2. investigate the pneumatic actuator for air leakage, especially at the joint of the valve stem and the cover at both ends;
3. check whether the solenoid valve is operating normally and whether there is air leakage;
4. check whether the fixing screws of all connecting parts are tight;
5. try to prevent too much floating ash from covering the actuator, and the mall should keep the working environment clean.
Pneumatic ball valve common fault cause analysis:
1. pneumatic ball valve has no response signal
The signal line of the pneumatic ball valve consists of a pair of control signal lines and a pair of reaction signal lines. When the PLC gives a signal to the valve, the signal is converted in the positioner of the regulating valve, and the valve stem action is controlled by the air source pressure. The stroke of the valve stem transmits the opening of the valve through the reaction signal of the regulating valve.
If the pneumatic ball valve does not respond to the signal, use a multimeter to check whether there is voltage at each contact. To check whether the line connection is correct, check whether the signal line is damaged, and check whether the signal line is loose.
2. valve cannot be closed to zero position
The valve cannot be closed to zero. First, it is closed to zero in practice, but the response indication is not. This is a signal problem and can be handled by adjusting the positioner;
Second, the practice is not strictly closed. It may be that the valve sealing gasket is damaged, or the rolling joint of the valve stem is blocked. This requires that the valve body be removed and the pneumatic ball valve manufacturer be contacted to replace the sealing gasket and lubricating oil be added to the rolling part so that it can operate normally.