Fittings drop Coefficient

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