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VFD with 3-way valves follow up
in my first posting on the original previous thread- to plug the bypasses. Glad we think alike! But I have reservations, each situational to each job.
This is what I posted:
It MAY (just MAY) be possible to disconnect the bypass port and use the body as a 2-way. You can ask your ATC contractor or whomever supplied that valve if that can work. That is the "poor man's approach" to show a benefit but the stroke aspects and Cv ratings may not be ideal. If not doing this method you have to replace the valves with 2-ways.
It is a good way to see if you are on the right track and for lowest first cost. Valve stroke and hysteresis may get a little wide though because of longer stroke times. (Characterized ball type control valves are less of an issue than piston types.)
Good call, Tim!