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Pipe Fittings: Valve, Swing check
Pipe fittings loss coefficients — Darby 3K method K-factors for elbows, tees, valves, and other fittings
| fitting type | K1 (dimensionless) | K ref (dimensionless) | Kd (dimensionless) | Ki (dimensionless) | category | description |
|---|---|---|---|---|---|---|
| Valve, Swing check | 1,500 | 1.969544 | 4 | 0.46 | Valve | Darby 3K: K = 1500.0/Re + 0.46*(1 + 4.0/D^0.3) |
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Elbow, 180°, all, (r/D = 1.5)1 rowElbow, 180°, flanged, (r/D = 1)1 rowElbow, 180°, threaded, close-return bend, (r/D = 1)1 rowElbow, 45°, long radius, (r/D = 1.5)1 rowElbow, 45°, mitered, 1 weld, (45°)1 rowElbow, 45°, mitered, 2 welds, (22.5°)1 rowElbow, 45°, threaded standard, (r/D = 1)1 rowElbow, 90°, (r/D = 2)1 rowElbow, 90°, (r/D = 4)1 rowElbow, 90°, (r/D = 6)1 rowElbow, 90°, 2 welds, (45°)1 rowElbow, 90°, 3 welds, (30°)1 row