electric plumbing valves

I am looking at splitting my long hot water circulation loop into two smaller loops. One idea is to have an electric valve on each loop and open and close as needed to circulate the hot water.

Does anyone have recommendations on electric valves - brands and models - or a good source for retail residential?

Two requirements to ensure the pump is not dead-headed:

• The valves should never be closed at the same time. I can build a small panel with interlocking relays to accomplish this. An alternate would be a 3-way valve that naturally requires one loop to be open.
  
• I would prefer the valves to not be normally-open or normally closed, though normally open would be preferred. A toggle control would be preferred.

The valves will be put into a 3/4" PEX circulation loop. I don't have a manifold design yet. I see custom copper manifolds are possible, and an all-PEX is probably feasible.

Here is a one-line of a possible solution, sans detail on the valving.

Here is the link discussing the existing set-up.
https://www.plumbingforums.com/threads/recirc-system-add-a-loop.14499/

No response on this post. Maybe a different question:
Has anyone used electrically actuated valves in their plumbing system? Recirc pumps seem common. How about electric valves?

this is a double post

it has been answered already

frodo said:

this is a double post

it has been answered already

Click to expand...

If you have a link to the other thread, please post it. Before posting this, I searched for 'electric actuated valve' and variants thereof, and did not find anything. I found some smart home shut-off valves, but that is not the right solution.
I saw you recommended a Honeywell V8044A1044, which might work, but it only lists 'diverting' valve.

2 Qs:
Reading some Honeywell articles, I believe I need a mixing valve. The 3-way will have the two loops (A and B) feeding into the valve, then one out to the pump (AB). Does this sound right?

I do not care about modulating the flow; Flow will switch 100% between A or B loops. For that reason, I do not believe the valve CV is important. Or is it? and if so, how do I choose that? System is 3/4 PEX with crimp fittings (maybe ~ 1/2 copper pipe flow).

Call us 1-888-757-4774, customer help line

Call honeywell and ask which valve would be the best for your application

frodo said:

Call us 1-888-757-4774, customer help line

Call honeywell and ask which valve would be the best for your application

Click to expand...

I called Honeywell. They state they do not provide recommendations on what valves to use.
I also called the above phone number which is for SupplyHouse.com. They stated they do not have any valves for this application. They stated the valves they sell are for boiler systems and might have lead (when I asked if such valves could be used in a residential hot water system).

So no help there. I could contact a plumber though not sure a plumber would have experience in this area (they would have experience connecting piping systems etc. but maybe not designing a system or specifying parts).

It might be that such an application in a residential setting is very atypical and maybe should be avoided. Of course, I am still stuck with a system that takes a significant time for hot water (when the pump is off) and has a large temperature drop when the pump is on.

Thoughts are appreciated.