Valve issue
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There are UV valves, EV valves, and FV valves on the diagram. It seems that the UV valve has no adjustable opening degree, while the FV valve is a pneumatic valve with an adjustable opening degree. So what’s the case with the EV valve?..
Reply to 1# An ordinary person: I’ve been looking at blueprints lately, and I’m also curious – what does USV refer to in terms of solenoid valves? What does ATM mean in the box? . . .