Resistance coefficient K calculator

flow through valves and fittings

online since 2010

Available in download version

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create list of custom fluid properties
resistance factor K for flow in valves and fittings
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compressible isothermal flow
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gas offtake flow
natural gas flow
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Calculator description

You can use the calculator for resistance coefficient (or resistance factor) K calculation for flow through valves and fittings.

Resistance coefficient K is proportional coefficient between pressure drop (head loss) and square velocity of fluid flowing through valves and fittings like an elbow, bend, reducer, tee, pipe entrance, pipe exit or valve.

With the resistance coefficient, K calculated, you can compute equivalent length l/d with pressure drop calculator, afterwards.

Resistance coefficient should be used with pressure drop calculator or with gas compressible flow calculator to calculate pressure drop in the piping system that includes obstructions like fittings and valves.

The pressure loss due to resistance in valves and fittings are in a direct relationship with the diameter on which velocity occurs.

Based on the size and shape of valves and fittings different values for resistance coefficient are computed.

Fittings and valves

Calculator includes flow resistance calculation for following fittings and valves:

90 deg elbow and pipe bend
return bend
standard elbow
mitre bend
standard tee
pipe entrance
pipe exit
sudden and gradual enlargement
sudden and gradual contraction
gate full bore valve
gate reduced bore valve
globe valve
swing check angled valve
swing check valve
lift check valve
tilting disk check valve
stop check valve
stop check angled valve
ball valve
butterfly valve
foot poppet valve
foot hinged valve
plug straight valve
three way valve

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