May I ask about the valve in this PID diagram?
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May I ask what kind of valve this is, and what does V1 represent?
In this image and the previous one, the valve is shown as hollow in one case and solid in the other
Isolation valve: a hollow shape indicates that the valve is normally open, while a solid shape indicates that it is normally closed
So what does V1 mean? Some also write V2
It should be a cylinder ball valve; a hollow shape indicates fault in the on state, while a solid shape indicates fault in the off state.
It’s hard to say; doesn’t your PID have a home page with diagrams explaining the meaning of the letters and symbols on them? V is the valve code; V1 and V2 are likely used to distinguish between valves of different specifications
Without any symbolic indications, the PID diagrams I received are incomplete; I thought that V1 referred to single-acting and V2 referred to double-acting.
When FC power is interrupted, the valve closes； Valve holds position during FL power outage ； The valve opens when there is a FO power interruption. I’m not sure about V1 and V2; could it be related to the way they are installed?