Putting three way valves in a variable flow system.
Putting three way valves in a variable flow system.
(OP)
Gents,
I have a design where three way vales have been added in a variable flow system, inorder to maintain a minimum flow.
This is againt what I was told; constant flow is three way valves and variable flow is two way valves for capacity control.
Who can tell me his experience with this. Will this work and what are the possible problems?
I have a design where three way vales have been added in a variable flow system, inorder to maintain a minimum flow.
This is againt what I was told; constant flow is three way valves and variable flow is two way valves for capacity control.
Who can tell me his experience with this. Will this work and what are the possible problems?





RE: Putting three way valves in a variable flow system.
RE: Putting three way valves in a variable flow system.
this can be far from simple problem, while picv valve marketeers tend to put it under carpet as it does not fit well with their "silver bullet" stories.
RE: Putting three way valves in a variable flow system.
RE: Putting three way valves in a variable flow system.
RE: Putting three way valves in a variable flow system.
variable-flow pump cannot operate properly at very low flows, and it either does not provide proper flow when too few fan coils are on or bypass if undesirable forced through some open fan-coils where there is no other bypass path.
moreover, large dead part of circuits needs time to cool down again which causes erratic temperatures in many rooms, not only those who are switched on, but also those that are on already as they suddenly receive water with higher temperature.
variable systems will work perfectly when switching scheme is not too demanding, but in many real situations designer has to make additional provision. this is far from simple recommendations which "solve all problems" according to some manufacturers.
RE: Putting three way valves in a variable flow system.