Water Tank Plumbing - SailNet Community
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post #1 of 11 Old 1 Week Ago Thread Starter
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Water Tank Plumbing

The way I see it the hose to the left is the fresh water hose to the sinks.

The two hoses to the right go to the two water tanks.

The valve does not look line a two-way valve though.

It looks like a simple on-off valve.

So exactly how is this supposed to work?
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Re: Water Tank Plumbing

That is what is called a 3 way ball valve. one tank or the other to the pump

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Re: Water Tank Plumbing

That's what it appears to be to me as well.

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Re: Water Tank Plumbing

You need to trace the lines to see for sure. I did that on my Boat so I could pump the ice box out through the water faucet. Two inlets, water Tank and Ice box, one discharge though the Boat. Someone might be doing something different here but I put a strainer on the ice box side so any floatsam would not foul the pump. I will flush some fresh behind the discharge water to prevent odors and I never move the discharge water through the water heater. Look carefully and you will see an arrow on the handle indicating flow.

Rereading your OP you could empty one Tank and switch rather than using both at the same time and running out of water.

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Re: Water Tank Plumbing

Looks like the valve is in the closed position in the photo. Move the handle to one side or the other to select which tank will feed the pump.
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Re: Water Tank Plumbing

So which side is right and what's left? 3 way ball valve is the best part of that system.
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Re: Water Tank Plumbing

Thank you, gentleman. I looked up 3-way ball valve and indeed that is what it seems to be.

What confused me it that it is pulling from one tank so I figured the current center position could not be off.

So I still don't know exactly what is going on.

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Re: Water Tank Plumbing

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Originally Posted by davidpm View Post
What confused me it that it is pulling from one tank so I figured the current center position could not be off.

With a three way valve, you have two possible positions, not necessarily "on" or "off". You either have one flow path or the other. This same arrangement can be achieved using two valves and some fittings, but the 3-way simplifies things. The valve may be marked to show which handle position corresponds to which flow path.

I work in the water treatment industry and we use these often. Usually inlet side is from a tank and you can either send it to drain or to another tank. Similar concept here

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Re: Water Tank Plumbing

There's an arrow on the handle, in its current position flow is from the right towards the camera. One port, usually the side, is directed either one end or the other. That's a standard 3 way configuration. I have seen some set up differently but from the arrow on the handle this is the one you have.
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post #10 of 11 Old 1 Week Ago Thread Starter
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Re: Water Tank Plumbing

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There's an arrow on the handle, in its current position flow is from the right towards the camera. One port, usually the side, is directed either one end or the other. That's a standard 3-way configuration. I have seen some set up differently but from the arrow on the handle, this is the one you have.



I checked the handle today. It will move towards the camera but will not go any further away from the camera.

I'll look for the arrow more carefully this weekend. Thanks again.

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