Control Valve Sizing

IEC 60534 / ISA-75 — Liquid · Gas · Steam · Cavitation · Choking · Body selection · Cost estimate

1Fluid Properties

SG = 0.998P_v = 0.0234 bar_aP_c = 220.9 bar_a

2Flow Rate

3Service Conditions

Inlet pressure P₁ (gauge)

Pressure drop ΔP (across valve)

Fluid temperature (°C)

Pipe bore — optional velocity check (mm ID)

4Valve Configuration

Valve type

Best control accuracy, tight shutoff. High ΔP capability.

F_L = 0.9 · x_T = 0.72

Cv safety margin for selection

Cv_rated ≥ Cv_calc × margin. Typical 1.1–1.3.

Tag number (optional)

5Specification Details

Shutoff leakage class (ANSI/FCI 70-2)

Metal-seated, standard. Most common general service.

Actuator type

Standard. Fail-safe to open or close. Requires instrument air supply.

Quantity

Enter flow, pressure, and fluid properties

Results update live · Liquid · Gas · Steam