This calculator applies the basic non-choked liquid Cv relation to the selected flow, pressure drop, specific gravity and sizing multiplier. It also reports an equivalent sharp-orifice diameter using a disclosed Cd=0.62 assumption. It does not select or qualify a solenoid valve.
Solenoid Valve · Liquid Flow Calculator
Explore basic selected liquid-sizing arithmetic without treating an equivalent orifice as a valve selection.
Equation Used
- The fluid is treated as incompressible.
- The selected pressure drop is available across the valve.
- The Cv relation omits viscosity, fittings, cavitation and choking corrections.
- Equivalent diameter uses constant Cd=0.62.
- Six millimetres is a comparison reference only.
- Electrical, thermal, materials, duty-cycle and safety checks are excluded.
Six millimetres is a comparison reference, not a universal limit for direct-acting valves.
Selected liquid-sizing reference
The drawing shows a normally closed two-port valve. Energizing the coil lifts the plunger and its seal against the spring, opening the seat passage. When power is removed, the spring closes the seal. The equivalent-diameter comparison is separate; the four inputs do not determine coil force, seat lift or valve construction.
What the calculator determines
The selected design flow is multiplied by the sizing margin before calculating required Cv, Kv and a Cd=0.62 equivalent ideal-orifice diameter.
Selected liquid-sizing arithmetic
Cv=M Qgpm√(SG/ΔPpsi); Kv=0.865Cv; A=MQ/(Cd√(2ΔP/ρ)); d=√(4A/π), with Cd=0.62.
Selected-input example
At 20 L/min, 0.5 bar, SG=1 and M=1.2, required Cv is about 2.35 and the Cd=0.62 equivalent diameter is about 9.1 mm.
Limits of the sizing calculation
Published Cv/Kv data, allowable pressure differential, coil force, seat geometry, viscosity, cavitation, flashing, fittings, temperature, materials and duty cycle must be checked for a real product. Six millimetres is retained only as a selected comparison reference, not a universal direct-acting limit.
Questions
Does the equivalent diameter choose a valve?
No. It is the diameter of the disclosed idealized Cd=0.62 orifice model, not a trim or port dimension.
Is 6 mm a direct-acting limit?
No. Product capability depends on force, pressure differential and construction; 6 mm is only a comparison reference here.
References & Further Reading
- Wikipedia contributors. Solenoid valve. Wikipedia
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