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Author:
george 7941 (Canada)
I replaced the fill valve on a Kohler San Raphael toilet yesterday and noticed that the original fill valve, #703 is a "dry well" valve. I have noticed dry well valves on other LoBoy toilets.
Is this because the tank is low and therefore,if the toilet is blocked, contaminated water could back up into the tank? The dry well is to ensure contaminated water will never be siphoned into the potable water piping?
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Author:
hj (AZ)
If what you call a "dry well" is what I think it is, then it is a device to let the tank fill with the valve wide open, and then when the water overflows into the well it shuts of quickly.
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Author:
m & m (MD)
Yes, it is a protection device for the ballcock. Even though the ballcock is probably an anti-siphon type, the water supply from the base of the ballcock to the top is unprotected in a 'flooded' state; hence, the drywell. You'll only see them in a one-piece toilet. ( I think.)
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Author:
george 7941 (Canada)
The "dry well" I am referring to is the dry reservoir the shank of the ballcock sits in and this reservoir extends above the normal water level in the tank. There are passages at the bottom of the well so that any water in the well will leak out on to the floor of the bathroom.
I have never come across a 2 piece LoBoy, so I see the dry wells in 1 piece toilets.
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Author:
hj (AZ)
At one time they were trying to introduce requirements that the shank of the fill valve would not pass through the water in the tank. Since the Case/Briggs were the only ones that would qualify, they could not do it, because it would amount to endorsing/requiring a specific product. That device in the Kohler toilet was their solution. The reason for the recommendation is that a low boy toilet, when it plugs up, can "mix" the water in the bowl with that in the tank, and they were concerned that a failure of the fill valve, ahead fo the vacuum breaker, while the water was shut down would contaminate the system.
Edited 1 times.
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