Selection Guide
FLOW RATE IN GPM (GALLONS PER MINUTE)
Cv
1.2 1.9 2.9 4.7 7.4 11.7 18.7 29.2 46.8 73.7
Pressure Drop (PSI)
1
1.2 1.9 2.9 4.7 7.4 11.7 18.7 29.2 46.8 73.7
2
1.7 2.7 4.1 6.6 10.5 16.5 26.4 41.3 66.2 104.2
3
2.1 3.3 5.0 8.1 12.8 20.3 32.4 50.6 81.1 127.7
4
2.4 3.8 5.8 9.4 14.8 23.4 37.4 58.4 93.6 147.4
5
2.7 4.2 6.5 10.5 16.5 26.2 41.8 65.3 104.6 164.8
6
2.9 4.7 7.1 11.5 18.1 28.7 45.8 71.5 114.6 180.5
7
3.2 5.0 7.7 12.4 19.6 31.0 49.5 77.3 123.8 195.0
8
3.4 5.4 8.2 13.3 20.9 33.1 52.9 82.6 132.4 208.5
9
3.6 5.7 8.7 14.1 22.2 35.1 56.1 87.6 140.4 221.1
10
3.8 6.0 9.2 14.9 23.4 37.0 59.1 92.3 148.0 233.1
11
4.0 6.3 9.6 15.6 24.5 38.8 62.0 96.8 155.2 244.4
12
4.2 6.6 10.0 16.3 25.6 40.5 64.8 101.2 162.1 255.3
13
4.3 6.9 10.5 16.9 26.7 42.2 67.4 105.3 168.7 265.7
14
4.5 7.1 10.9 17.6 27.7 43.8 70.0 109.3 175.1 275.8
15
4.6 7.4 11.2 18.2 28.7 45.3 72.4 113.1 181.3 285.4
16
4.8 7.6 11.6 18.8 29.6 46.8 74.8 116.8 187.2 294.8
17
4.9 7.8 12.0 19.4 30.5 48.2 77.1 120.4 193.0 303.9
18
5.1 8.1 12.3 19.9 31.4 49.6 79.3 123.9 198.6 312.7
19
5.2 8.3 12.6 20.5 32.3 51.0 81.5 127.3 204.0 321.3
20
5.4 8.5 13.0 21.0 33.1 52.3 83.6 130.6 209.3 329.6
21
5.5 8.7 13.3 21.5 33.9 53.6 85.7 133.8 214.5 337.7
22
5.6 8.9 13.6 22.0 34.7 54.9 8 7.7 137.0 219.5 345.7
23
5.8 9.1 13.9 22.5 35.5 56.1 89.7 140.0 224.4 353.5
24
5.9 9.3 14.2 23.0 36.3 5 7.3 91.6 143.1 229.3 361.1
25
6.0 9.5 14.5 23.5 37.0 58.5 93.5 146.0 234.0 368.5
26
6.1 9.7 14.8 24.0 37.7 59.7 95.4 148.9 238.6 375.8
27
6.2 9.9 15.1 24.4 38.5 60.8 97.2 151.7 243.2 383.0
28
6.3 10.1 15.3 24.9 39.2 61.9 99.0 154.5 247.6 390.0
29
6.5 10.2 15.6 25.3 39.9 63.0 100.7 157.2 252.0 396.9
30
6.6 10.4 15.9 25.7 40.5 64.1 102.4 159.9 256.3 403.7
FLOW RATE IN GPM (GALLONS PER MINUTE)
Cv
47 74 117 176 211
Pressure Drop (PSI)
1
47 74 117 176 211
2
66 105 165 249 298
3
81 128 203 305 365
4
94 148 234 352 422
5
105 165 262 394 472
6
115 181 287 431 517
7
124 196 310 466 558
8
133 209 331 498 597
9
141 222 351 528 633
10
149 234 370 557 667
11
156 245 388 584 700
12
163 256 405 610 731
13
169 267 422 635 761
14
176 277 438 659 789
15
182 287 453 682 817
16
188 296 468 704 844
17
194 305 482 726 870
18
199 314 496 747 895
19
205 323 510 767 920
20
210 331 523 787 944
21
215 339 536 807 967
22
220 347 549 826 990
23
225 355 561 844 1012
24
230 363 573 862 1034
25
235 370 585 880 1055
26
240 377 597 897 1076
27
244 385 608 915 1096
28
249 392 619 931 1117
29
253 399 630 948 1136
30
257 405 641 964 1156
Sizing Water Valves
Two-Position Applications: The valve is normally sized with the largest Cv available.
Modulating Applications: The valve should be sized to produce the required Cv with a pressure drop of one to two times the
pressure drop across the coil at rated flow.
Example: Coil requires 14 gpm at 5 psi pressure drop. The valve should be selected to provide 14 gpm with a pressure drop across
the valve between 5 and 10 psi (one to two times the pressure drop across the coil at the required flow).
Solution: From the table below a 1/2 in., 4.7 Cv valve will provide 14.1 gpm flow at a pressure drop across the valve of 9 psi.
This valve should be selected as the valve will provide the needed flow with a pressure drop between one and two times the
pressure drop across the coil at the required flow.
VG1000 Ball Valves 1/2 through 2 inch
Sizing Water Valves
Two-Position Applications: The valve is normally sized with the largest Cv available.
Modulating Applications: The valve should be sized to produce the required Cv with a pressure drop of one to two times the
pressure drop across the coil at rated flow.
Example: Coil requires 180 gpm at 4 psi pressure drop. The valve should be selected to provide 180 gpm with a pressure drop
across the valve between 4 and 8 psi (one to two times the pressure drop across the coil at the required flow).
Solution: From the table below a 74 Cv valve will provide 181 gpm flow at a pressure drop across the valve of 6 psi. This valve
should be selected as the valve will provide the needed flow with a pressure drop between one and two times the pressure drop
across the coil at the required flow.
VG1000 Ball Valves 2-1/2 through 4 inch
15 vg1000 selection guide vg1000 selection guide 16
SIZING WATER VALVES