Plant Hydraulics - Public Water Systems - page 922

Fig. 26-24. Combining flow—branch angle 120 —loss coefficient K 23 ( Source: Reference 7;
courtesy of the BHR Group Limited)

TABLE 26-4. Headloss and Discharge Coefficients
Type of Gate or Valve Headloss Coefficient*

Sluice gate 0.2 to 0.8

Gate valve 10 to 0.20

Butterfly valve 0.16 to 0.5

Cone valve 0.04

Angle Valve 1.8 to 5

Globe Valve 4 to 10

Plug valve 0.5 to 1

Check valve (swing) 0.6 to 2.5

Diaphragm or pinch valve 0.2 to 2.3

Ball valve 0.04

* Based on valves fully open.