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By definition, Cv is the flow coefficient of a control device or flow restriction. Cv is defined as the number of US gallons of 60°F water per minute which will flow through the given restriction with a one pound per square inch pressure drop.
(Flow in GPM of 60°F water at 1 psi pressure drop, Specific Gravity=1)
| Valves Size | Disc Angles, Degrees | ||||||||
| 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | |
| 1 | 1 | 3.5 | 8 | 12 | 16 | 20 | 32 | 42 | 45 |
| 1.5 | 2.1 | 4.5 | 9 | 17 | 31 | 51 | 80 | 137 | 219 |
| 2 | 3.5 | 7 | 15 | 27 | 51 | 83 | 130 | 222 | 355 |
| 2.5 | 4.9 | 10 | 22 | 39 | 73 | 119 | 186 | 317 | 508 |
| 3 | 8 | 16 | 34 | 61 | 113 | 185 | 289 | 493 | 789 |
| 4 | 13 | 28 | 60 | 106 | 198 | 323 | 505 | 862 | 1,380 |
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