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Old 10-27-2008, 10:23 AM   #1
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1 1/2 inch zone valve - can't find


I'm remodeling my basement and want to zone it. The existing heating system uses continuous 1 1/2 inch piping running around the perimeter of the house with venturis at each radiator. In the remodeled basement I'm using baseboard radiators with 3/4 inch plumbing.

At first I was just going to get a 1 1/2 inch zone valve for the upstairs heating and the run of the mill 3/4 inch for the basement, but the largest zone valve I can find is 1 1/4 and they are expensive. While I could use this with reducers, I didn't know if this would restrict the flow too much to the upstairs heating.

So, I got this bright idea that I would split the 1 1/2 supply line out of the boiler and use two 3/4" or 1 inch zone valves in parallel and combine back to 1 1/2 inch on the other side.

Would this work or am I out to lunch?

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Old 10-28-2008, 07:35 AM   #2
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1 1/2 inch zone valve - can't find


Venturis???

Is this a monoflo system.
If so, a 1" zone valve could be too small. And reduce water flow too much.

Easier way. Is to install a flow check on the existing loop, and use an IFC circ(Taco makes them) for the new basement zone.

May need to use a 2" flowcheck, depending on what circulator is on the mono loop.

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Old 11-20-2008, 10:03 AM   #3
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1 1/2 inch zone valve - can't find


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Originally Posted by beenthere View Post
Venturis???

Is this a monoflo system.
If so, a 1" zone valve could be too small. And reduce water flow too much.

Easier way. Is to install a flow check on the existing loop, and use an IFC circ(Taco makes them) for the new basement zone.

May need to use a 2" flowcheck, depending on what circulator is on the mono loop.
It's an old monflo plumbed in 1 1/2 inch. I gave up the search anyway and ended up zoning it with IFC Grundfos circs.
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