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Old 05-03-2019, 15:54   #16
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Re: Options for water tank vents?

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Originally Posted by Mexican Hat View Post
Thanks for all the replies. Food for thought.

Coopec, I looked up that water maker you mentioned. Looks like a pretty good deal compared to the others out there.
Yes, I agree. The guy selling them acknowledges the Karcher pump won't have a long life but he points out you can buy them on Amazon for $89 so you can always carry a spare. (How long will an expensive pump last?)

Here they are for sale on sBay (read the write-up) and there is also a Youtube video clip as well.

https://www.ebay.com.au/itm/21-GPH-W...AP~:rk:13:pf:0

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Old 05-03-2019, 15:58   #17
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Re: Options for water tank vents?

Sorry for the lengthy link but there are air control valves commonly available for water and hot water systems. The one below is brass and sells for 11.45 USD.

https://www.googleadservices.com/pag...9aACCFM&adurl=
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Old 07-03-2019, 10:14   #18
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Re: Options for water tank vents?

Thanks Thunderhoof and Wakefield, those are the kind of valves I was hoping to find. I will order one or two and see what works best. The irrigation valve with the floating ball was how I imagined a solution so I appreciate the link.
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Old 07-03-2019, 11:59   #19
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Re: Options for water tank vents?

Why not use an automotive rollover vent valve?
https://www.onallcylinders.com/2015/...er-vent-valve/
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Old 07-03-2019, 13:46   #20
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Re: Options for water tank vents?

Thunderhoof, I asked the supply house about the vent you referred me to. Apparently it only functions to release excess pressure and does not allow air to flow the other way. Good for filling, not so good for drawing down.

So it looks like the irrigation ball valve or perhaps, and thank you Gord, back to the original idea of an automotive roll-over valve.
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Old 08-03-2019, 14:23   #21
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Re: Options for water tank vents?

I simply ran a length of drinking water blue nylon hose from the tank top to the top of the galley, where it goes into one of those in-line filters used in garden irrigation systems. That stops any little critters making their way into the hose. The inside of the filter is looseley packed with stainless steel soap-less scrubbers. Air gets in or out, but dust and insects do not.
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Old 08-03-2019, 14:44   #22
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Re: Options for water tank vents?

I'm following this with interest. An excellent question.


But I do have a few concerns.

1. roll over valves have to be mounted above the filler. In many (not all) cases, it would be simpler at that point to vent outside the hull. If it is lower it will seep, which is annoying but not serious with fresh water.



2. The tank is slam full. Auto tanks have over pressure relief devises, but the water tank on your boat does not. At the very least, when the hot water heater comes on that volume will expand. Thus, you need to stop filling the tank before it is full.

3. Not all air releases allow air back into the system; many are one-way. The ag valve seems good, but the hydronic valve is probably one-way.

4. The relief needs to be MORE than the fastest you will ever draw water. Not a huge amount, but some of these valves are for pretty small flows and assume there is considerable pressure driving it.

None of these are show stoppers, just discussion points. This can work.
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Old 09-03-2019, 12:20   #23
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Re: Options for water tank vents?

Thinwater, good points.

The hydronic valve is only one way so ruled that out.

My pumps are all manual, one galley foot pump and one head hand pump so I don't think flow volume is too critical.

The three tanks are only for drinking water, no water heating involved, but the vent fittings were installed an inch or so below the top of the tank so should allow for normal thermal expansion.

As for placing the vent, some more reading suggests that the valve has to be above the tank and with no 'p' trap like bends in it to ensure free air flow. So yeah, the positioning of the valve negates some of the advantage of not having to run a vent pipe up high. Will still provide the security of regulating overfilling though which was my main goal.

I have tried looking for bigger automotive roll-over valves. The biggest I can find is 1/2 inch but I'm uncertain if they work when liquid flows in from below or if they only work when upside down. Experimentation required. I'm going to order one of the ag valves and a large roll-over valve and see how they function.

Watch this space...
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