Explain about Equal percentage Control Valve Characteristics


#1

The equal percentage valve plug produces the same percentage change in flow per fixed increment of valve stroke at any location on its characteristic curve.

For example, if 30% stem lift produces 5 gpm and a lift increase of 10% to 40% produces 8 gpm or a 60% increase over the previous 5 gpm, then a further stroke of 10% now produces a 60% increase over the previous 8 gpm for a total flow of 12.8 gpm.

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These types of valves are commonly used for pressure control applications and are most suitable for applications where a high variation in pressure drop is expected.