A better starting point
for the engineering conversation.
Explore the V-port principle and estimate a clean-liquid capacity requirement. Final selection still needs a reviewed valve datasheet.
Start with the flow.
Then select the valve.
Estimate the required Kv and Cv for a clean, single-phase liquid under turbulent, non-choked conditions. This calculation does not select a valve size.
Excluded: gases, steam, flashing, cavitation, choked flow, viscous or non-Newtonian media and significant solids. Final sizing needs the selected trim curve, recovery factors and the complete operating envelope.
A quarter turn.
A controlled opening.
Watch the V-notched segment rotate past the seat. A small opening appears first, then grows as the shaft turns toward the fully open position.
0° closed · 90° open
V-notch in control
The notch progressively exposes the seat opening as the segment rotates.
What the V does. Its shaped leading edge introduces a smaller opening at low travel, supporting gradual modulation. Actual capacity depends on the trim and operating conditions.
Illustration, not a sizing curve. This generic cutaway explains motion and opening. It does not predict Cv, leakage, velocity, or a specific model’s internal dimensions.
Let’s specify the right valve.
Share your operating conditions. We will review the valve, trim, actuator and documentation as one package.