Linear and Equal Percent Control Valve Application

Hi there,

This is not so simple to answer. To truly select the correct control valve characteristic - you need to know the process gain.

As a rule of thumb:

You would use a =% chracteristic on the following process': pressure control

Linear: Level control and flow control.

For a more in depth explanation download the Emerson Control Valve Handbook from www.emmersonprocess.com It is a free download and will explain many more things to you about control valve selection.

Regards,

Craig