What is the professional term for the component in the wiring box of a pneumatic diaphragm valve?
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Could everyone please take a look? There are two red and blue components in the wiring box of the pneumatic diaphragm valve. What is the professional term for these?
Judging from the appearance of the valve, it might be under valve inspection
Is it a proximity switch for position feedback?
Used for detecting on/off positions, similar to a feedback switch.
Travel switch, used for inputting digital signals; signals indicating whether the valve is open or closed in place. If you open the valve, but the resistance of the valve is too high or there is no power supply (in the case of a pneumatic valve, there is no air), the valve cannot be opened; as a result, the limit switch will not close, and the DCS can determine that the valve has not been opened fully. This valve has a feedback mechanism, while pneumatic control valves lack such a mechanism; they do not provide an analog signal to the DCS to convey information regarding the opening degree of the control valve
If there are moving parts, it is a microswitch; if not, it might be a photoelectric proximity switch