ξ = minor loss coefficient
Δpminor_loss = minor pressure loss (Pa (N/m2), psf (lb/ft2))
ρf = density of fluid (kg/m3, slugs/ft3)
v = flow velocity (m/s, ft/s)
Minor loss coefficients for commonly used pipe and tube system components:
|Type of Component or Fitting||Minor Loss Coefficient|
- ξ -
|Tee, Flanged, Dividing Line Flow||0.2|
|Tee, Threaded, Dividing Line Flow||0.9|
|Tee, Flanged, Dividing Branched Flow||1.0|
|Tee, Threaded , Dividing Branch Flow||2.0|
|Elbow, Flanged Regular 90o||0.3|
|Elbow, Threaded Regular 90o||1.5|
|Elbow, Threaded Regular 45o||0.4|
|Elbow, Flanged Long Radius 90o||0.2|
|Elbow, Threaded Long Radius 90o||0.7|
|Elbow, Flanged Long Radius 45o||0.2|
|Return Bend, Flanged 180o||0.2|
|Return Bend, Threaded 180o||1.5|
|Globe Valve, Fully Open||10|
|Angle Valve, Fully Open||2|
|Gate Valve, Fully Open||0.15|
|Gate Valve, 1/4 Closed||0.26|
|Gate Valve, 1/2 Closed||2.1|
|Gate Valve, 3/4 Closed||17|
|Swing Check Valve, Forward Flow||2|
|Ball Valve, Fully Open||0.05|
|Ball Valve, 1/3 Closed||5.5|
|Ball Valve, 2/3 Closed||200|
|Diaphragm Valve, Open||2.3|
|Diaphragm Valve, Half Open||4.3|
|Diaphragm Valve, 1/4 Open||21|
The minor loss a ball valve with flow velocity 2 m/s with water with density 1000 kg/m3 can be calculated as
Δpminor_loss = (5.5) (1000 kg/m3) (2 m/s)2 / 2
= 11000 Pa
= 11 kPa
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