4 replies to this topic

[shinloo]

Hi all,

I would like to know the differences between actuated valves and control valves.

Also, I would like to know what are:-
1. self operated pressure reducing regulator
2. self operated backpressure regulator

Also, please tell me where can I get fundamental / basics of all types of valves.

Thanks very much for your help.

regards,
shinloo

[JoeWong]

Check out in the listing...

[djack77494]

shinloo,
I would recommend you get your hands on the Emerson (formerly Fisher) Control Valve Handbook for thorough orientation to all control valve topics. Regulators, by the way, are really a type of control valve not requiring a separate controller.

In a sense, most valves are actuated - you can in some manner adjust the valve's opening at will. More common usage of the term, however, would be to use the word "actuated" to mean a valve which has a device (actuator) attached that can supply the mechanical force needed to cause changes in the valve's position; e.g. from open to closed. That device may be a motor, diaphragm, or piston, so the motive force may be electrical, pneumatic, or hydraulic. A control valve is just an actuated valve where the actuator is modulated via a signal from a controller.

A self operated regulator has a connection to the process and uses a process variable such as pressure, level, or temperature to generate the force that actuates the valve. Perhaps the simplest example of a self operated regulator is the level regulator valve inside a toilet. The liquid level causes a float to rise or sink and the float, through mechanical linkages, adjusts the valve's position.

You contrast the terms "pressure reducing" and "backpressure" regarding regulators. the difference is merely what variable is being controlled. The pressure reducing regulator is controlling (reducing) the upstream pressure; the backpressure regulator is controlling the downstream pressure.

[Qalander (Chem)]

Hi all,

I would like to know the differences between actuated valves and control valves.

Also, I would like to know what are:-
1. self operated pressure reducing regulator
2. self operated backpressure regulator

Also, please tell me where can I get fundamental / basics of all types of valves.

Thanks very much for your help.

regards,
shinloo

Dear shinloo Hello /Good Morning,
Although you have been very thoroughly guided by Doug &Joe already, but somehow
I have a query as if the question in your OP was to deal with 'Controlled values' and 'Actuated values' or rephrasing 'Controlled variables' and Actuated Variables' if this is any way the case then scenario might change for responding to your OP.

[shinloo]

Hi all,

Qalander, thanks for your concern but my question is well-answered by Joe and Doug. Thanks, everyone for your replies.

Regards,
SL