Make control valves a focal point for improvements to process performance and economics.
A control valve system includes a valve body, a stem or shaft, a valve trim and closure member (e.g., plug, ball, or disc), an actuator, and related accessories (e.g., a current-to-pressure transducer, a positioner, an air booster relay, and an air set). This system of components is collectively dubbed the control valve.
The connected pieces act dynamically on each other to alter the flowrate or pressure across the valve. A change in the input signal causes the transducer and/or positioner to move the actuator. The actuator moves the valve stem or shaft, which moves the closure member, changing the process flow through the valve (or differential pressure across the valve in cases of constant flowrate). Each response in this chain of events presents an opportunity for problems. Proper control valve engineering and selection can help to avoid or minimize such issues. Rather than a source of problems, control valves can be a focal point for improvement to process performance and economics.
Would you like to access the complete CEP Article?
No problem. You just have to complete the following steps.
You have completed 0 of 2 steps.
-
Log in
You must be logged in to view this content. Log in now.
-
AIChE Membership
You must be an AIChE member to view this article. Join now.
Copyright Permissions
Would you like to reuse content from CEP Magazine? It’s easy to request permission to reuse content. Simply click here to connect instantly to licensing services, where you can choose from a list of options regarding how you would like to reuse the desired content and complete the transaction.