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

 

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Tags: Velocity Equations Coefficient Equations Friction Equations Valve Equations Tables