The failure of the pneumatic control valve to meet the flow standard may be caused by a variety of reasons. The following are some common reasons and their analysis:
I. Insufficient gas supply pressure:
Pneumatic control valves require a certain air source pressure to work properly. If the air supply pressure is insufficient, it will directly affect the degree of opening and flow output of the valve.
Solution: Check whether there is any leakage or insufficient pressure in the air supply pipeline, repair it in time and adjust the air supply pressure to the appropriate range.
II. Pipeline blockage:
Sediment, rust and other impurities accumulated in the pipeline will form resistance, resulting in a decrease in flow rate when the fluid passes through.
Solution: Clean the pipe or replace the blocked pipe section to ensure that the fluid passage is unobstructed.
III. Insufficient valve opening:
The valve core or actuator of the pneumatic control valve may have faults, such as valve core wear, poor sealing, aging spring, etc., which may cause the valve to be unable to fully open to the preset position.
Solution: Check and repair the internal faults of the valve to ensure that the valve can open normally to the required opening.
IV. Regulating valve core or valve seat problems:
Dirt or damage on the surface of the regulating valve core or valve seat will affect the flow and sealing performance of the fluid, thereby reducing the flow rate.
Solution: Clean and overhaul the regulating valve core and valve seat regularly to keep their surfaces clean and intact.
V. Improper installation of pneumatic transmission device:
Improper installation position, angle or connection method of the pneumatic transmission device may cause smooth transmission or air leakage, affecting the normal operation of the valve.
Solution: Check and adjust the installation position and connection of the pneumatic transmission device to ensure that they are correct.
VI. The adjustment range is too small:
The adjustment range of the selected pneumatic control valve may be too small meet the actual flow requirements.
Solution: According to the actual demand, select a pneumatic control valve of appropriate size to improve its adjustment range and flow output capacity.
VII. Control system issues:
The control system of the pneumatic control valve may have problems such as incorrect parameter settings and inaccurate signal transmission, which may cause the valve to be unable to adjust according to the preset instructions.
Solution: Check and adjust the control system parameter settings to ensure accurate signal transmission; replace the control system or related components if necessary.
VIII. Installation and fixing issues:
The poor installation or loose fixing of the pneumatic control valve may cause the valve position to shift or shake, affecting the normal flow of the fluid and the adjustment accuracy.
Solution: Reinstall and secure the pneumatic control valve to ensure that its position is stable and meets the design requirements.
To sum up, the reason why the pneumatic control valve flow rate does not meet the standard may involve many aspects such as air supply pressure, pipeline blockage,valve opening, regulating valve core and valve seat status, pneumatic transmission device installation, adjustment range, control system, installation and fixing.
In practical applications, each problem should be investigated and solved according to the specific situation.
