Why use two solenoid valves? ? What does gas path mean?

2021-12-30View Original

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Why use two solenoid valves? ? What does gas path mean?

Reply #22021-12-30

There are diagrams on the solenoid valve; it’s best to draw out the control piping on site, and then everything will be clear. For reference.

Reply #32022-01-02

Look at the PID diagram; there are explanations. There should be two interlock conditions

Reply #42022-01-02

One to open the solenoid valve, one to close it

Reply #52022-01-03

Generally, a DCS controls one solenoid valve, while a SIS or ESD controls another solenoid valve; the gas path is the route taken by the instrument air.

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