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Sizing coefficients
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Control Valve Rating
ISA method for control valves sizing and noise prediction
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SI - International system
USCS - US Customary
Select your preferred measuring units standard
PROCESS SPECIFICATION
flowType
Mass flow rate
Inlet pressure
Outlet pressure
Density
Critical pressure
Vapor pressure
Ratio Cp/Cv
LIQUID
GAS
kg/hr
kg/s
t/hr
bar
kPa
MPa
Pa
mbar
atm
mmHg
bar
kPa
MPa
Pa
mbar
atm
mmHg
kg/m3
kg/cm3
bar
kPa
MPa
Pa
mbar
atm
mmHg
bar
kPa
MPa
Pa
mbar
atm
mmHg
VALVE SPECIFICATION
Valve nominal diameter
Cv at fully rated travel [gpm]
Fl - Liq. press. rec. fact.
Xt - Press. drop. ratio fact.
1/8
1/4
3/8
1/2
3/4
1
1 1/4
1 1/2
2
2 1/2
3
3 1/2
4
5
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
PIPE CONNECTIONS
Inlet pipe nominal size
Outlet pipe nominal size
1/8
1/4
3/8
1/2
3/4
1
1 1/4
1 1/2
2
2 1/2
3
3 1/2
4
5
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
1/8
1/4
3/8
1/2
3/4
1
1 1/4
1 1/2
2
2 1/2
3
3 1/2
4
5
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
AERODYNAMIC NOISE
Sound level prediction
Inlet temperature
Mole mass
Fd - Valve style modif.
Outlet pipe schedule
enable
disable
STD
XS
XXS
10
20
30
40
60
80
100
120
140
160
tempC
tempK
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