| Fitting |
Types |
Coefficient |
| 45° Elbow |
Standard (R/D = 1) |
0.35 |
| Long Radius (R/D =
1.5) |
0.2 |
| 90° Elbow Curved |
Standard (R/D = 1) |
0.75 |
| Long Radius (R/D =
1.5) |
0.45 |
| 90° Elbow Square
or Mitred |
|
1.3 |
| 180° Bend |
Close Return |
1.5 |
| Tee, Run Through |
Branch Blanked |
0.4 |
| Tee, as Elbow |
Entering in run |
1 |
| Tee, as Elbow |
Entering in branch |
1 |
| Tee, Branching
Flow |
|
1 |
| Coupling |
|
0.04 |
| Union |
|
0.04 |
| Gate valve |
Fully Open |
0.17 |
| 3/4 Open |
0.9 |
| 1/2 Open |
4.5 |
| 1/4 Open |
24 |
| Diaphragm valve |
Fully Open |
2.3 |
| 3/4 Open |
2.6 |
| 1/2 Open |
4.3 |
| 1/4 Open |
21 |
| Globe valve, Bevel
Seat |
Fully Open |
6 |
| 1/2 Open |
9.5 |
| Globe Valve,
Composition seat |
Fully Open |
6 |
| 1/2 Open |
8.5 |
| Plug disk |
Fully Open |
9 |
| 3/4 Open |
13 |
| 1/2 Open |
36 |
| 1/4 Open |
112 |
| Angle valve |
Fully Open |
2 |
| Y valve or blowoff
valve |
Fully Open |
3 |
| Plug cock |
\thetaθ = 5° |
0.05 |
| \thetaθ = 10° |
0.29 |
| \thetaθ = 20° |
1.56 |
| \thetaθ = 40° |
17.3 |
| \thetaθ = 60° |
206 |
| Butterfly valve |
\thetaθ = 5° |
0.24 |
| \thetaθ = 10° |
0.52 |
| \thetaθ = 20° |
1.54 |
| \thetaθ = 40° |
10.8 |
| \thetaθ = 60° |
118 |
| Check valve |
Swing |
2 |
| Disk |
10 |
| Ball |
70 |
| Foot valve |
|
15 |
| Water meter |
Disk |
7 |
| Piston |
15 |
| Rotary
(star-shaped disk) |
10 |
| Turbine-wheel |
6 |
