You may need to clarify your question and add a bit of context.
A control valve is a bit generic and covers a whole range of different type of valves, an "Actuated Valve" in my opinion would be one such type of "control valve".
Not only are there many different types of "Control Valve" but there are also many different types of "Actuator" and not every "Control valve" has an "Actuator" as such.
Actuated valves could also be on/off valves which to some people don't neccessarily mean the same thing as a control valve.
In my industry control valves are usually only modulating valves.
Chances are they are identifying the actuated valve as opposed to a manual valve. Those actuators are quite a bit more expensive, and maybe somebody is just accounting for it.
In our company Actuated valves would describe both the on/off types and also modulating types (although we tend to short hand the on/offs as ABVs). However a self contained pressure regulating valve we also describe as a "control valve" but this does not have an "actuator" as such.
I am sure someone who is more up to date with the ISA standards will give a true definition of "control valve" but it does seem to be a little generic and seems to change from industry to industry and company to company.
A self-contained pressure regulating valve would be called a regulator.
An actuated valve imply that it is not a regulator, but has acutation (either on/off or modulating).
A control valve imply that it is controlling a process variable, and can be wither on/off (eg. gap level control) or modulating (eg. typical flow control valve).
"Do not worry about your problems with mathematics, I assure you mine are far greater."
Albert Einstein
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I think Ashereng has it right--each of the three kinds of actuation has members of the other two groups.
Pig launchers often have actuated valves for both the side valve and the body-isolation valve that are only locally controlled by a manual switch. These are "actuated" but not "control". An ESD is an example of an on/off valve that is controlled by other than manual processes.
Basically, any valve with an actuator is "actuated". Any valve that receives a control signal from a process variable is a "control valve". Any actuated valve that controls based on a local analog "signal" is a "regulator" (which is also a "control valve").
I just read my latest posting. Either I need new batteries in my keyboard, or a spell checker.
"Do not worry about your problems with mathematics, I assure you mine are far greater."
Albert Einstein
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Zuccus is right. I need to identify the actuated valve from the manual valves but i do not know if e.g. pressure safety valve, shut down valve, temperature valve etc can be classified under actuated valve. Or it limits to those manual valves with actuators on it. Thanks in advance.
A shutdown valve is describing its function/purpose. A shudown valve may be acutated, or manual.
A temperature valve is also describing its function/purpose. It can be modulating, on/off, or manual.
A "manual valve" by definition does not have an actuator (other than your hand).
"Do not worry about your problems with mathematics, I assure you mine are far greater."
Albert Einstein
Have you read FAQ731-376 to make the best use of Eng-Tips Forums?
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