Explain about Equal percentage Control Valve Characteristics


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.


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.