Quick opening trim for continuous control

M

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Mantu

Is it possible for a control valve to act as continuous modulating pressure control normally, but act as on-off control in case of high pressure surges? The on-off function has to be fast to release pressure quickly and hence quick opening trim is desired. But control requirement may demand linear or equal percentage trim.
 
V
You can operate your valve a couple of ways. I don't suggest switching to quick-opening trim if you ever want decent control. You can use solenoid valves to override the input signals of the positioner. Depending on how large the valve/actuator combo are you may need to add a volume booster and quick exhaust valve. Basically, you can do what you want to do with this valve but don't use quick-opening trim to solve it. You'll never get control on the low end of valve stroke which will lead to chattering.
 
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