Cv Flow Coefficient Table 2018-05-10T05:09:02+00:00

Cv Flow Coefficient Table

cv-e1449301943676Data for Calculation of Flow and / or Pressure Drop 

Kv = Cv x 0.85

A Valve coefficient Cv is used to calculate pressure drop through a particular Valve for a given flow rate. The coefficient of flow Cv expresses the rate of flow in gallons per minute at 60o F water with a pressure drop of 1 psig across the valve. The Cv coefficients for the various types of size, shown in the tables, have been determined form calculations and actual flow tests.

Note: Kv is the metric equivalent of Cv

 For Liquids:

Where             QL=Flow in U.S. Gallons per minute.
ΔP  = (P1 – P2) Pressure drop in psl.
GL = Specific gravity of liquid ( Water = 1 at 60o F )

 For Gas:

Where           Qg = Volumetric flow of gas (SCFH)
Gg= Specific gravity of gas standard conditions (air at atmosphere and  60o F = 1)                            T =  Absolute temperature of gas ( o F + 460 )

 For Steam:

 Note    :  For saturated steam TS = 0
W W = Pounds per hour of steam
ΔP     = (P1 – P2) Pressure drop in psl
TS     =  Degree of superhear ( o F )

Note ; For gas and steam, max. ΔP = 1/2 P1 and min. P2 = 1/2 P1 and P1, P2 are absolute    pressure (psia)   P1 = inlet pressure, P2 = outlet pressure

 

Size inInches Gate or Bellow Seal ValvesStandard Port Full PortGate Valves Globe Valves Bellow Seal GlobeValves
150 – 800 900 – 1500 150 – 1500 150 – 800 900 – 1500 150 – 800 1500 – 2500
1/4, 3/8 2.6 2.6 2.6 2 2 1.5 –
1/2 7 14 14 3 3 2.5 5
3/4 14 14 22 4 4 3.5 7
1 30 30 34 6 8 6 9
1.1/4 85 85 92 14 19 12 30
1.1/2 100 100 110 14 19 12 34
2 160 160 200 33 29 28 38

API 600-Cast Steel Valves( Flanges, Weights & Cv Flow Coefficients) 

 

ASMEClass Dimensions in Inches Weight in Lbs. CV Flow
SizeIN FlangeDia BoltCircle HoleDia No.of BoltsDia Gate Globe
    Dia   Holes   Bw Ff Bw Ff Gate Globe
150# Raised Face 2 6.00 4.75 0.75 4 5/8 42 48 48 55 260 35
2.1/2 7.00 5.50 0.75 4 5/8 50 59 54 58 420 60
3 7.50 6.00 0.75 4 5/8 67 78 82 102 625 92
4 9.00 7.50 0.75 8 5/8 97 117 120 152 1150 180
6 11.00 9.50 0.88 8 3/4 180 198 240 280 2650 430
8 13.50 11.75 0.88 8 3/4 278 319 405 435 4850 810
10 16.00 14.25 1.00 12 7/8 456 515 500 550 7750 1400
12 19.00 17.00 1.00 12 7/8 646 735 1050 1200 11500 1950
14 21.00 18.75 1.13 12 1 875 954 1700 1850 14000 2500
16 23.50 21.25 1.13 16 1 1120 1200 2300 2500 19000 3400
18 25.00 22.75 1.25 16 1.1/8 1485 1570 2640 2850 24000 4500
20 27.50 25.00 1.25 20 1.1/8 1825 1910     31000  
24 32.00 29.50 1.38 20 1.1/4 2870 2690     45000  
300# Raised Face 2 6.50 5.00 0.75 8 5/8 46 60 45 60 260 35
2.1/2 7.50 5.88 0.88 8 3/4 55 76 63 72 420 60
3 8.25 6.62 0.88 8 3/4 90 115 88 114 625 92
4 10.00 7.88 0.88 8 3/4 136 166 130 171 1150 180
6 12.50 10.62 0.88 12 3/4 245 314 261 337 2650 430
8 15.00 13.00 1.00 12 3/4 415 506 447 565 4850 810
10 17.50 15.25 1.13 16 1 646 762 1000 1150 7750 1325
12 20.50 17.75 1.25 16 1.1/8 900 1100 1300 1550 11500 1950
14 23.00 20.25 1.25 20 1.1/8 1392 1720 1800 2100 14000 2500
16 25.50 22.50 1.38 20 1.1/4 1870 2220 2300 2700 19000 3400
18 28.00 24.75 1.38 24 1.1/4 2405 2960 2640 3200 23500 4500
20 30.50 27.00 1.38 24 1.1/4 3260 3700     30000  
24 36.00 32.00 1.63 24 1.1/2 4250 5100     44000  
600# Raised Face 2 6.50 5.00 0.75 8 5/8 60 72 60 72 260 35
2.1/2 7.50 5.88 0.88 8 3/4 89 102 89 100 420 60
3 8.25 6.62 0.88 8 3/4 130 157 130 150 625 92
4 10.75 8.50 1.00 8 7/8 224 275 213 285 1150 180
6 14.00 11.50 1.13 12 1 394 540 415 515 2650 430
8 16.50 13.75 1.25 12 1.1/8 726 884 1050 1220 4850 800
10 20.00 17.00 1.38 16 1.1/8 1125 1405 1550 1830 7750 125
12 22.00 19.25 1.38 20 1.1/4 1490 1812     11500  
14 23.75 20.75 1.50 20 1.3/8 2200 2500     13000  
16 27.00 23.75 1.62 20 1.1/2 3000 3700     18000