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Valve linear and equal percent characteristics difference

asked Mar 14, 2014 in E&I by RichS29 (4,320 points)
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commented Mar 14, 2014 by adsam (530 points)
Below is my quick answer to you query. Are you looking for anything specific, let me know, may be we can help.

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answered Mar 14, 2014 by adsam (530 points)

The flow characteristics of a control valve is the relationship b/w the flow rate through the valve and the valve travel position between 0 to 100%.

Linear flow characteristics

The change in flow resulting from a fixed increment of valve travel is constant throughout the whole stroke. Linear flow characteristic valves are generally used for liquid flow services and for certain flow control applications requiring constant gain.

Equal-percent flow characteristics

Equal increments of valve travel produce equal percentage changes in the existing flow. Equal percent flow characteristics valves are generally used for pressure control applications.

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