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G Series Valves
Engineering Data

CPV has conducted extensive flow tests and has established flow constants as CV factors for each size valve. The CV is defined as the gallons of water in a one minute period that will flow thru a valve in the full open position creating a pressure drop of 1 psi.

The pressure drop or AP for liquids can be calculated by using formula #1 and inserting the proper specific gravity.

The pressure drop for gases can be calculated by using formula #2 and inserting the proper specific gravity of the gas.

Formulas

CV Factors
ORIFICE
 GLOBE ANGLE
SIZE INCH MM CV CV
0 .218 5.5 .9 1.3
1 .313 8.0 2.0 2.8
2 .438 11.1 4.3 6.0
3 .500 12.7 6.1 8.5
4 .625 15.9 9.2 12.9
5 .813 20.7 16.2 22.7

Specific Gravity
GAS
 S.G. LIQUID S.G.
AIR* 1.0 WATER* 1.0
ARGON 1.377 ACETONE 0.79
CO2 1.516 ALCOHOL 0.79
HELIUM 0.138 BENZENE

0.902
HYDROGEN 0.0696 KEROSENE 0.815
NITROGEN 0.966    
OXYGEN 1.103    
* @ 68°F/20°C

G Series Photo

ORIFICE
 G OPEN H J MAX. K
SIZE INCH MM INCH MM INCH MM INCH MM INCH MM
0 .218 5.5 4.53 115.1 3.50 88.9 .25 6.4 1.20 30.5
1 .313 8.0 4.80 122.0 3.50 88.9 .44 11.2 1.20 30.5
2 .438 11.1 5.41 137.4 3.50 88.9 .44 11.2 1.53 38.9
3 .500 12.7 6.50 165.1 4.50 114.3 .69 12.1 1.78 45.2
4 .625 15.9 6.38 162.1 5.25 133.4 .56 14.2 1.78 45.2
5 .813 20.7 7.72 196.1 7.25 184.2 .88 22.4 2.16 54.9

 

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