Three way vs two way vales
Three way vs two way vales
(OP)
Does anyone have some good literature explaining the benefits of a two way vs a three way valve system for a chilled water application or can someone give me some bullet points?
What would be your thoughts on converting a existing three way valve system to a two way with a vfd running the pumps? Feasible?
What would be your thoughts on converting a existing three way valve system to a two way with a vfd running the pumps? Feasible?





RE: Three way vs two way vales
RE: Three way vs two way vales
Whether your system is feasible depends on a lot of size and operation factors which is for you to determine. There is usually a lot of work in getting at and changing all those valves.
RE: Three way vs two way vales
I'm in the process of doing that now for the campus chilled water distribution system.
RE: Three way vs two way vales
RE: Three way vs two way vales
Typically, you let 5% to 10% of the total flow in each zone (floor for eg) to be on a 3-way configuration to relieve the pressure form the system (use end-of the run oils on 3-way valves). Or, install a 3/4" by-pass at teh end of the run of each zone
Because your when the load goes below the lowest VFD speed, your pump will dead head as your valves are closing but your pump slow any further (typically pumps do not go below 40% of maximum speed) as you will need a place to relieve the pressure in the piping system.
RE: Three way vs two way vales
i regularly use bypass pressure control valves.
RE: Three way vs two way vales
RE: Three way vs two way vales
RE: Three way vs two way vales
however, you gave me idea that some manufecters reps look at "Appendix G" or similar as holy text so they turn their heads on the other side when faced with problems not covered by papers
RE: Three way vs two way vales
RE: Three way vs two way vales
"Oops, we must not have set that one in the factory".
Number 5 in a row. Great chillers, just hard to get past finger pointing between controls, TAB and mechanical.
RE: Three way vs two way vales
RE: Three way vs two way vales
RE: Three way vs two way vales
RE: Three way vs two way vales