Pneumatic control valve working principle and structure classification
Operating principle of pneumatic control valve:
Pneumatic control valve uses compressed air as power source, cylinder as actuator, and uses electrical valve positioners, converters, solenoid valves, retaining valves and other accessories to drive the valve to complete on-off or proportional adjustment. The control signal of the industrial automation control system completes the adjustment of the pipeline medium: flow, pressure, temperature and other process parameters. Pneumatic control valve is characterized by simple control, fast response, and substantial safety, no need to adopt other explosion-proof methods.
Structure classification:
According to the valve action method, it can be divided into two methods: linear stroke and angular stroke.
Features of pneumatic control valve:
The operation is simple, quick response, and substantial safety, no need to adopt anti-explosion measures.
Guidelines for pneumatic control valve devices:
(1) The position of the pneumatic control valve device must have a certain height from the ground. A certain space must be left above and below the valve, and a certain space should be left above and below the valve to facilitate valve disassembly and repair. Disassembly and repair. Regarding control valves equipped with pneumatic valve positioners and handwheels, it is necessary to ensure easy operation, investigation and adjustment.
(2) The regulating valve should be installed on a horizontal pipeline, and the vertical and vertical pipelines should generally be supported under the valve to ensure safety and reliability. Straight, generally need to be supported under the valve to ensure safety and reliability. Regarding special occasions, in special occasions when the horizontal installation of the regulating valve is required on a vertical pipeline, the regulating valve should also be supported (when on the road, the regulating valve should also be supported (the small-diameter regulating valve is outside). At the time, it is necessary to prevent additional stress to the regulating valve,).
(3) The operating environment temperature of the regulating valve should be (-30～+60) The operating environment temperature of the regulating valve should be (-30～60) (-30 relative humidity not greater than 95% 95%. ℃, relative humidity not greater than 95%.
