Gods, what kind of valve is this?
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A lot of advice from the great masters for newbies on the road.
Are you sure this picture is correct? Below is a diagram of a regulating valve, but it is equipped with a three-way solenoid valve on a pneumatic switching valve.
Solenoid valves should not be introduced in this diagram.
The three-way solenoid valve controls the on/off of the instrument air source of the pneumatic regulating valve. This is a pneumatic valve control system for reference.
Level regulating valve with shut-off function