Friday, February 12, 2010

What is the difference between flow control and pressure reducing valve?

any difference in application of stem,fluid of these valvesWhat is the difference between flow control and pressure reducing valve?
None. The only difference is the controlled variable. All valves are flow control elements. The controller attached to the valve tells the valve what to do.





If it is a pressure control valve, the pressure sensor signal will be compared to a setpoint and move the valve to open or close. Same if it is a flow control valve, except that you will have a flow meter instead.





Addendum - Remember you cannot control the pressure in ';solid'; (liquid only systems).


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.What is the difference between flow control and pressure reducing valve?
The difference is which process you are trying to control. A flow control valve is maintaining a desired setpoint of flow and a pressure control valve is maintaining a desired setpoint for pressure. Usually the best type of valve for controlling flow is a globe valve and it is used in all applications. Many types of valves are used for pressure control, but the most common is probably a gate valve.





Oh, and steam is a fluid
pressure and flow are two different things. a flow control valve controls the ammount of flow to a device i.e. steam turbine control valves. a pressure reducing valve reduces pressure to the user i.e. regulator on an airsystem used to drop instrument air to a useable pressure.

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