Pipe flow calculators
Calculator Description
For known flow coefficient Cg or Kg of some gas control valve you can calculate that control valve capacity for known upstream and downstream pressure of pressure regulator with this calculator. If you know gas control valve capacity and upstream and downstream pressure of pressure regulator, you can calculate control valve flow coefficient, either Cg or Kg, with this calculator too. With that calculated value of flow coefficient you can pick correct pressure regulator from manufacturer's table. Gas control valve sizing calculator is based on the EN 334 standard  control valves and pressure regulators for pressures up to 100 bar.

Calculate:
 Maximum flow rate through gas control valve
 Flow velocity
 Flow coefficient

Input:
 Valve diameter
 Pressure drop
 Gas properties
Calculator Features
 For compressible gas flow
 Metric and imperial flow coefficient calculation
Q: Calculate flow coefficient of gas control valve for 500 gpm. Valve diameter is 2 in. Pressure in front of valve is 45 psi and after the valve is 25 psi. Gas temperature in front of valve is 288 K, gas constant 287 J/kgK and kappa is 1.4
A: Calculation setup:
Input values:
q = 500 gpm US
D = 2 in
p_{u} = 45 psi
p_{d} = 25 psi
T_{u} = 288 K
R = 287 J/kgK
kappa = 1.4
Q: Calculate pressure drop in gas control valve with flow rate of 500 gpm and flow coeffient of C_{g} 150. Valve diameter is 4 in. Upstream pressure is 45 psi. Gas temperature in front of valve is 288 K, gas constant 287 J/kgK and kappa is 1.4
A: Calculation setup:
Input values:
q = 500 gpm US
D = 4 in
p_{u} = 45 psi
C_{g} = 150
T_{u} = 288 K
R = 287 J/kgK
kappa = 1.4
Q: Calculate capacity of gas control valve with flow coeffient of C_{g}150 and pressure drop of 10 psi. Upstream pressure is 45 psi. Valve diameter is 3 in. Gas temperature in front of valve is 288 K, gas constant 287 J/kgK and kappa is 1.4
A: Calculation setup:
Input values:
D = 3 in
p_{u} = 45 psi
deltap = 10 psi
C_{g} = 150
deltap = 4 psi
T_{u} = 288 K
R = 287 J/kgK
kappa = 1.4
Gas flow coefficient calculation is based on the following formula:
Read more about used theory on flow in valves and fittings page.
If you experience problems with calculator start try to find answers on instructions page.
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