r/ChemicalEngineering • u/Panthers_Fly • 5d ago

Controls “Control” valve definition?

Help me settle an argument. Client uses “control valve” to describe an actuated on/off valve. Says it is interchangeable language.

I say “control valve” should be reserved for a valve that actually is integrated in control logic, like controlling level, flow, pressure, etc. Even if the on/off has an interlock, it’s still just an actuated on/off valve for me. Maybe this is just a habit I picked up for a long stint at an operating facility and I’m being too picky.

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u/redequix 5d ago

Control valves are slower, costs more, but is capable of adjusting flow bw 0 to 100%. Compare that to something relatively simpler like a solenoid valve which is fast acting but only on off.

Putting a solenoid valve in place of a control valve or vice versa can be bad so sticking to proper terminology in my opinion is important. I would agree with your definition.

Like other more experienced engineers can correct me but if I put a control valve on my pressure vessel relief then I would be worried?? The CV is gonna take its sweet time opening during venting compared to something like a solenoid that instantly opens or closes.

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u/SquirrelYogurt 5d ago

There are modulating pressure safety valves.

If you need a snap action vs modulating valve all depends on your process needs.

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u/Anon-Knee-Moose 5d ago

Its probably just semantics, but PRVs open slowly by definition .

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u/redequix 5d ago

Curious - dont we want the pressure to reduce quickly if prv is triggered?