A circular port area is multiplied by sin of entered wing angle to form an effective-area screen. A separate annular-gap approximation uses circumference times entered clearance.
Wing Throttle Valve Interactive Calculator
Enter wing angle, port diameter, pressure and seat clearance. Outputs are geometric/index quantities—not steam flow, valve force, leakage rate or a boiler safety calculation.
Equation Used
- Angle is clipped to 0-90 degrees.
- Opening fraction is defined as sin(angle).
- Port is circular.
- Gap area is circumference times uniform clearance.
- Flow coefficient, steam state, force, leakage rate and safety are omitted.
Wing-Valve Geometry Screen
The visual rotates a rigid wing in a circular port while keeping the gap-area and pressure-area outputs explicitly non-flow indices.
What This Calculator Represents
Projected opening geometry plus a separate uniform-gap approximation.
Geometry and Index
Aeff=piD2u/4
I=P Aeff
Agap=piDc
Worked Scenario
At 90 degrees, 90 mm diameter, 12 bar and 0.15 mm clearance, opening is 100%; the other outputs remain geometric/index values.
Model Boundary
No flow coefficient, steam property, actuator force, leakage rate, stress or safety is calculated.
Frequently Asked Questions
Is effective area actual flow area?
It is an assumed sine-scaled area, not a flow-calibrated opening area.
Does the pressure-area result give valve force?
No.
Is gap area a leak rate?
No.
Is pressure absolute?
The tool uses the entered number only.
Are losses included?
No.
Can this size a steam valve?
No.
References
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