Valve Selection
Valve Selection Guide
Balancing Valves should be selected according to GPM flows, not line sizes. | ||||
Valve Size | Minimum Flow | Nominal Range of Flow | Maximum Flow | |
Nominal Dimensions | ||||
Inches | mm | GPM/LPM | GPM/LPM | GPM/LPM |
1/2 | DN 15 | 0.14 / .52 | 0.5 – 3.8 / 1.89 – 14.36 | 12.1 / 45.7 |
3/4 | DN 20 | .26 / .98 | 3.8 – 5.5 / 14.36 – 20.8 | 17.4 / 65.7 |
1 | DN 25 | .37 / 1.38 | 5.5 – 9.5 / 20.8 – 36 | 30 / 113.4 |
1 1/4 | DN 32 | .60 / 2.28 | 9.5 – 14 / 36 – 53 | 44.6 / 169 |
1 1/2 | DN 40 | .91 / 3.46 | 14 – 20 / 53 – 76 | 66.4 / 251 |
2 | DN 50 | 1.52 / 5.76 | 20 – 33 / 76 – 125 | 107.2 / 406 |
2 1/2 | DN 65 | 2.13 / 8.07 | 33 – 100 / 125 – 378 | 318.3 / 1205 |
3 | DN 80 | 4.19 / 15.9 | 100 – 117 / 378 – 442 | 374.5 / 1418 |
4 | DN 100 | 6.09 / 23 | 117 – 200 / 442 – 756 | 646.8 / 2448 |
5 | DN 125 | 7.61 / 28.8 | 200 – 320 / 756 – 1210 | 1025 / 3879 |
6 | DN 150 | 13.7 / 51.9 | 320 – 440 / 1210 – 1663 | 1447 / 5477 |
8 | DN 200 | 30.3 / 114 | 440 – 650 / 1663 – 2460 | 2100 / 7940 |
10 | DN 250 | 76.3 / 289 | 650 – 1300 / 2460 – 4915 | 4050 / 15300 |
12 | DN 300 | 76.3 / 289 | 1300 – 1600 / 4915 – 6050 | 4750 / 17590 |
Correction For Liquids
Applies to liquids other than water. Correct the measured flow (q) by the density (γ) according to this formula.
Sizing a Balancing Valve
When the differential pressure and design flow are known, use this formula to calculate Cv value.