I’m a beginner; I’d like to ask how to determine the adjustment value of a control valve by looking at its appearance
Thread Content
I’m a beginner and would like to ask how one can determine, by looking at its appearance, whether a control valve is pneumatic, electric, or self-acting
Pneumatic types definitely have an air supply interface; electric types do not require air supply but do need power supply. Self-acting types neither require external air supply nor power supply
Electric ones are easy to judge; they have motors and require an electrical signal to be connected； Pneumatic types have an air supply interface, along with a diaphragm chamber or cylinder ； In the self-acting type, a pressure guide tube extends from the diaphragm head to the pipeline for measuring pressure.
If you are familiar with valve structure, this is quite easy. Pneumatic systems require an external air supply, and they also have a positioner component that consumes electricity as well. Some also have more complex air circuits. It’s electric; there’s no gas supply nor a positioner, just an external power supply line connected to the motor. It operates independently with no external wiring.
Each control valve comes with a nameplate, so it’s easy to tell.
Same as the reply above – this question is quite simple