Contents - index


ValveCoef_Inc_CL

 

 

The procedure ValveCoef_Inc_CL uses simple sizing equations to determine the valve coefficients (C_v and K_v) for a valve with incompressible flow given the flow conditions, pressure drop and required flow rate.  The method programmed in this procedure is a simplified method described here as well in other sources.  A more complex method is programmed in the procedure ValveCoef_Inc_ISA75_CL.

 

ValveCoef_Inc_CL(F$,T_1,P_1,P_2,Q, Conc:K_v, C_v)

 

Inputs:

 F$   fluid

 T_1  inlet temperature (C, K, F, or R)

 P_1,P_2 inlet and outlet pressures (kPa, Pa, bar, MPa, atm, or psi)

  Q flow rate (m^3/s or ft^3/min)

  Conc concentration (%), only required if fluid is a solution (brine)

 

Output:

  K_v  SI valve coefficient (-), returned as dimensionless but technically this is measured as m^3/hr of water passing through a valve with a pressure drop of 1 bar

  C_v English valve coefficient (-), returned as dimensionless but technically this is measured as gpm of water passing through a valve with a pressure drop of 1 psi

 

Example:

$Load Component Library

$UnitSystem SI Mass J Pa K

 

F$ = 'Acetone'

T_1 = 320 [K]

P_1 = 500e3 [Pa]

P_2 = 300e3 [Pa]

Q = 0.05 [m^3/s]

 

CALL ValveCoef_Inc_CL(F$,T_1,P_1,P_2,Q, 0 [%]:K_v, C_v)

 

{Solution:

K_v = 111.0 [-]

C_v = 128.4 [-]

}

 

Index