A graph measuring Critical Flow Factor. The two axis are: Fluid Travel Through Valve and Pressure. There is also a legend for upstream pressure and downstream pressure.

What is Critical Flow Factor (Cf)?

What is Critical Flow Factor (Cf)? Critical Flow Factor (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-style control valves have a Cf that stays consistent regardless of the trim position,
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