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What is the critical flow factor in the control valve critical?

Critical Flow Factor often referred to as “Cf” is a coefficient that defines how pressure will recover after it drops to its lowest point inside the control valve.
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    Critical Flow Factor often referred to as “Cf” is a coefficient that defines how pressure will recover after it drops to its lowest point inside the control valve. This lowest point is also referred to as the vena contracta*.
    All globe type control valves have a Cf that stays consistent regardless of the trim position, unlike the Flow Coefficient (Cv).

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