Control Valve Sizing
Control Valve Sizing (Cv)
Sizing Condition
Valve & Line Parameters
Minimum Case
Liquid Phase
Normal Case
Liquid Phase
Maximum Case
Liquid Phase
Detailed Results
| Parameter | Unit | Min | Norm | Max |
|---|
Overall Sizing Summary
Minimum Case Cv:-
Normal Case Cv:-
Maximum Case Cv:-
Valve Suggestion
Selected Type:-
Suggested Size:-
Rated Cv:-
Min % Open:-
Norm % Open:-
Max % Open:-
Technical Notes
Variable Definitions
- Service Type: Liquid / Gas / Two‑Phase sizing mode.
- P₁, P₂ (kPa(a)): Upstream/downstream absolute pressure.
- wₗ, wᵍ (kg/h): Mass flowrates.
- Fₗ, xₜ: Pressure recovery and differential ratio factors.
- Cv: Valve flow coefficient.
Formulas (IEC 60534)
- Liquid: Cv = Q / (0.0865 · Fp · √(ΔP / Gf))
- Gas: Cv = W / (35.6 · Fp · Y · √(x · P₁ · ρ₁))
- Two‑Phase: Cv ≈ √(Cv_liq² + Cv_gas²) (Screening only)
Assumptions
- Pressures are absolute (kPa(a)).
- Viscosity corrections are not applied.
- Two-phase uses a root-sum-square engineering approximation.