Habonim Catalog Interactive 2024 V04 15022024 - Catalog - Page 220
CONTROL VALVES
Calculations
Glossary
Flow equation
Fluid
Service condition
Equation
Sub-critical condition
∆P < FL2 (P1-PV)
Liquid
Critical condition
∆P < FL2 (P1-PV)
X < FK • XT
Gas
X => FK • XT
Saturated
steam
X < FK • XT
X => FK • XT
Superheated
steam
X < FK • XT
X => FK • XT
Cv:
Valve flow coefficient
FL:
Liquid pressure recovery factor of a valve without attached
fittings (dimensionless) - Refer to Table 1
GL:
Liquid specific gravity (1.0 for water @ 15°C)
P1:
Upstream absolute static pressure (kgf/cm2A)
P2:
Downstream absolute static pressure (kgf/cm2A)
PV:
Absolute vapour pressure of liquid at inlet temperature
(kgf/cm2A) - Refer to Table 2
∆P:
Differential pressure (P1-P2) (kgf/cm2)
QL:
Volumetric flow rate of liquid (m3/h)
WL:
Weight or mass flow rate of liquid (t/h)
Gg:
Gas specific gravity - Refer to Table 3
Qg:
Volumetric flow rate of gas (m3/h)
X:
Ratio of pressure drop (∆P/P1)
XT:
Pressure drop ratio factor (dimensionless) - Refer to Table 1
Wg:
Gas or steam mass flow rate (kg/h)
ρ1:
Specific gravity, upstream conditions (kg/m3).
FK:
Ratio of specific heat factors, (dimensionless) - Refer to Table 3
Y:
Expansion factor =
T1:
Absolute upstream temperature (K)
∆t:
Upstream superheated steam temperature (°C)
Z:
Compressibility factor, dimensionless = 1
Table 1
Percent of valve rotation (degree of rotation)
0(0)
Equal %
Round port
FL
XT
FL
XT
0.00
0.00
0.00
0.00
10(9)
0.96
0.72
0.92
0.78
20(18)
0.95
0.65
0.91
0.74
Table 2
30(27)
0.94
0.60
0.91
0.71
40(36)
0.93
0.54
0.90
0.67
50(45)
0.92
0.48
0.86
0.62
60(54)
0.90
0.42
0.80
0.56
70(63)
0.88
0.36
0.72
0.49
80(72)
0.86
0.28
0.61
0.38
90(81)
0.82
0.16
0.61
0.26
100(90)
0.75
0.12
0.50
0.15
Table 3
Pv factor
Liquid
Acetone
Acetic acid
Ammonia
Benzene
Butane
Carbon dioxide
Ethene
Ethanol
Ethylene glycol
Glycerin
Nitrogen
OIL WT32
OIL WT46
Sulfur dioxide
Water
Formula
C2H4
C2H4O2
NH3
C6H6
C4H10
CO2
C2H6
C2H6O
C2H4(OH)2
C3H5(OH)3
SO2
H2O
Gg and Fk factors
Pv
47.861
0.0273
0.7310
0.1621
2.89
58.420
47.861
0.1029
69.58 e-6
110.50 e-9
0.988
205.48 e-6
306.59 e-6
3.3929
0.0238
Gas
Air
Ammonia
Argon
Carbon dioxide
Carbon monoxide
Ethylene
Chlorine
Ethane
Helium
Hydrogen
Methane
Oxygen
Nitrogen
Saturated steam
Superheated steam
Formula
Gg
Pk
NH3
Ar
CO2
CO
C2H4
Cl2
C2H6
He
H2
CH4
O2
N2
H2O
H2O
1.00
0.59
1.38
1.52
0.97
0.97
2.49
1.05
0.14
0.07
0.55
1.10
0.97
-
1.00
0.92
1.19
0.91
1.01
0.87
0.96
0.87
1.19
1.00
0.90
1.00
1.00
0.94
0.94
Habonim’s valve sizing software (HVS) is available to download from Habonim website: www.habonim.com, to support sizing
220
CONTROL VALVES
