Loss Coefficient for Fittings and Valves
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Loss Coefficient for Fittings and Valves |
|
| Component | Loss Coefficient K |
| Elbows | |
| 90 Short Elbow, flanged | 0.3 |
| 90 Short Elbow, threaded | 1.5 |
| 90 Long Elbow, flanged | 0.2 |
| 90 Long Elbow, threaded | 0.7 |
| 45 Long Elbow, flanged | 0.2 |
| 45 Short Elbow, threaded | 0.4 |
| 180 Return | |
| 180 Return, flanged | 0.2 |
| 180 Return, threaded | 1.5 |
| Tees | |
| Line flow, flanged | 0.2 |
| Line flow, threaded | 0.9 |
| Branch flow, flanged | 1.0 |
| Branch flow, threaded | 2.0 |
| Union, Threaded | 0.08 |
| Valves | |
| Diaphragm, fully open | 2.3 |
| Diaphragm, 1/4 closed | 21 |
| Diaphragm, 1/2 closed | 4.3 |
| Globe, fully open | 10 |
| Angle, fully open | 2 |
| Gate, fully open | 0.15 |
| Gate, 1/4 closed | 0.26 |
| Gate, 1/2 closed | 2.1 |
| Gate, 3/4 closed | 17 |
| Swing Check, forward flow | 2 |
| Swing Check, backward flow | \(\infty\) |
| Ball, fully open | 0.05 |
| Ball, 1/3 closed | 5.5 |
| Ball, 2/3 closed | 210 |
| Water meter | 7 |
Tags: Velocity Equations Coefficient Equations Friction Equations Valve Equations Tables