How do you install and calibrate a limit switch on a control valve? (original) (raw)

A limit switch is a device that detects the position of a control valve and sends a signal to a controller or indicator. It is one of the common accessories that can enhance the performance and functionality of a control valve. However, to ensure its accuracy and reliability, you need to install and calibrate it properly. In this article, you will learn how to do that in six easy steps.

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In most cases control valves do not have limit switches in first place. Control valves are used to control flow hence the input is analog input output is in form of flow changes. It is not for On and Off operations. Hence control valves have Position Transmitters instead. It transmit back the exact location of valve stem. Limit switches are used in application which want to know if valve is full open or full close. Mostly control valve is never fully open nor fully closed but is throttling somewhere in middle to control flow. Limit switches are used in On-Off valves.

How do you install and calibrate a limit switch on a control valve? (original) (raw)

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