Rules of Thumbs for Sizing Control Valves
In many applications where control valves are applied, sizing and selection can be quite challenging. In the majority of applications, it is either the control valve is under sized or over-sized. In an undersized control valve, the valve is unable to deliver the required flow for each stage of the valve lift creating control problems.
Over-sized control valves will under all normal operations be confined to small openings of the valve with great risk of variable sensitivity and aggravation of any uneven movement of the valve and actuator combination. Poor accuracy and unstable control are often the result of over-sized control valves.
Given the problems that could arise because of failure to size control valves accurately, the following rules of thumb are presented as a guide for the selection and sizing of control valves:
Over-sized control valves will under all normal operations be confined to small openings of the valve with great risk of variable sensitivity and aggravation of any uneven movement of the valve and actuator combination. Poor accuracy and unstable control are often the result of over-sized control valves.
Given the problems that could arise because of failure to size control valves accurately, the following rules of thumb are presented as a guide for the selection and sizing of control valves:
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