water flow (control) in 3-way valve application
water flow (control) in 3-way valve application
(OP)
Water circulates in a closed system either:
pump - supply pipe - diverting valve - heat exchanger - return pipe - pump
or:
pump - supply pipe - diverting valve - return pipe - pump.
Is not flow greater, while the pump total head unconditionally less in the second case, independently on the (reasonable) temperature differences in both cases?
pump - supply pipe - diverting valve - heat exchanger - return pipe - pump
or:
pump - supply pipe - diverting valve - return pipe - pump.
Is not flow greater, while the pump total head unconditionally less in the second case, independently on the (reasonable) temperature differences in both cases?





RE: water flow (control) in 3-way valve application
Sorry, but it's not clear what you are asking.
RE: water flow (control) in 3-way valve application
If it closes the way to the coil and opens bypass, system's resistance decreases, the flow in the primary circuit increases, the head of the pump supplying the liquid to the machine falls ?
RE: water flow (control) in 3-way valve application
With a 2-way valve, it is different. As valves close down, the total head on the system increases and the pump operating point will ride the curve up toward shutoff. To avoid this a bypass valve can be added at the end of the run, or use a 3-way valve for the last unit or two (or 3). You have to give the water somewhere to go.
RE: water flow (control) in 3-way valve application
RE: water flow (control) in 3-way valve application
I believe the intrinsic characteristic of the built-in 3-way valves on fancoils units (no balancer on bypass) is equal resistance in all positions ? Or it may be not case depending on a manufacturer ?
RE: water flow (control) in 3-way valve application
RE: water flow (control) in 3-way valve application
RE: water flow (control) in 3-way valve application