I am installing 2 Moen 3330's in a shower. Each valve will have a its own dedicated shower head. I want to place one rain head that can be fed from either valve (not both at the same time). I think I can do this, but will need to install check/flow valve on either side of the rain head. Am I correct that I need a flow valve? If so, how do I properly size the valve?
2 Shower Valves to 1 Rain Head
- Thread starter Sig32
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A rain head shower head has an input pipe. What is the other side?
I think you are picturing 2 non-rain showerheads and 1 rain showerhead (which I will call #3). You want either
- all off
- showerheads 1 + 3
- showerheads 2+3
I think you might mean two check valves that both direct water to the rain head, but will block an unintended flow back to the one of the 3 showerheads that you don't want flow from. So would you need the two checkvalves? I don't know. I am just trying to clarify your intention.
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Jadnashua
Retired Defense Industry Engineer xxx
You should be able to use two diverter valves, one at each shower valve. It won't matter if both valves are set to the rain shower head, and if the diverter valves are installed properly, it shouldn't run through and activate the other's 'normal' head. I'm still not sure why you feel the need for this. It would probably be easier to just use a multi-port diverter and run with one shower valve.
My plan is as follows using two Moen 3330 valves:
Valve 1 and 2 options.
Position one - regular shower head (1 dedicated head for each valve)
Position two - rain head (1 rain head shared by each valve)
Position three - regular and rain combined
Eeach valve will have one line feeding into a tee at the rain head. My concern is that when one valve is feeding the rain head, it will continue through the the tee and cause back pressure and perhaps backward feed the other valve (depending what position its in). I thought that might not be good and so to prevent that I would need a flow valve to prevent the water from one valve to continue passed the tee at the rain head. Thoughts?
Valve 1 and 2 options.
Position one - regular shower head (1 dedicated head for each valve)
Position two - rain head (1 rain head shared by each valve)
Position three - regular and rain combined
Eeach valve will have one line feeding into a tee at the rain head. My concern is that when one valve is feeding the rain head, it will continue through the the tee and cause back pressure and perhaps backward feed the other valve (depending what position its in). I thought that might not be good and so to prevent that I would need a flow valve to prevent the water from one valve to continue passed the tee at the rain head. Thoughts?
Jadnashua
Retired Defense Industry Engineer xxx
If the diverter works, it should not be an issue.
rjbphd
In the Trades
Why do you need dual valves to supply one shower head?
Jadnashua
Retired Defense Industry Engineer xxx
I'm neither a plumbing pro nor an inspector, but IMHO, it should work. If you can get to the second level tech support, you could ask the manufacturer, but the general, help desk person probably wouldn't know or be able to tell you as they typically only know the more common answers. You could do what you want with one centrally located valve and a multiport diverter, but then you'd have to agree on the temperature if both main showers were being used at the same time. By only using one valve, you'd possibly be able to upgrade to a thermostatically controlled valve, which, I prefer, for about the same costs. That's nice since as you use up all of the hot water, it will continually be trying to adjust to keep the outlet temp the same...nice if you're the second person taking a shower (or third, etc.). Certainly won't make hot water, but can keep things constant as long as there is some.
I am looking to do the same thing and considering if I need two check valves. Did this work for you?
Mario Gomez
New Member
Has anyone tried this yet?...I'm about to start my plumbing on this similar scenario, 2 valves each having there own body sprays/shower head, but both controlling a common rain head!!! I'm guessing a check valve on each line feeding the rain head would be the safest way to go since pressure isn't really an issue since it is a rain head.
YoplaiTexas
New Member
Hi Mario, did this work out for you? I'm also considering doing the two check valves.
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