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  Topic Review (Newest First)
08-17-2006 11:20 PM
Brilliant
Quote:
Originally Posted by Ken73
OK, so your RO unit doesn't have an auto-shutoff on it? I just bought a household drinking water RO unit from Lowe's, and it has a built-in auto-shutoff valve in it. Or am I misunderstanding it? I plumbed the output up to the trash can with the float valve. When it's filled up the trashcan, it shuts it off, then the undersink reservoir fills up and the RO unit stops, and doesn't waste any more water.

I bought the unit from Lowe's because I'm running it for drinking water as well as my ice maker - I made the trashcan reservoir for water changes (and it works wonders!)
Yes the auto-shutoff valve will be fine. Mine started acting up.

If your always applying pressure to the unit the auto-shutoff will be fine. I was turning my water to the unit off and on and it got stuck.

I have a unit under my sink for drinking water and its fine with the water always on...its using the auto-shutoff valve.
08-17-2006 11:14 PM
Ken73 OK, so your RO unit doesn't have an auto-shutoff on it? I just bought a household drinking water RO unit from Lowe's, and it has a built-in auto-shutoff valve in it. Or am I misunderstanding it? I plumbed the output up to the trash can with the float valve. When it's filled up the trashcan, it shuts it off, then the undersink reservoir fills up and the RO unit stops, and doesn't waste any more water.

I bought the unit from Lowe's because I'm running it for drinking water as well as my ice maker - I made the trashcan reservoir for water changes (and it works wonders!)
08-17-2006 10:46 PM
Brilliant
Quote:
Originally Posted by Ken73
Hi Guys, just out of curiosity, is there an advantage of this setup over using a regular Kent Marine float valve? I've got my trash-can RO setup with a mechanical float valve on it, and it's been doing fine.

The float valve is for overflow.

This solenoid is to prevent the "waste water" from flowing after the float valve kicks off...because most units still flow. My "auto-shutoff-valve" was actually causing me grief with output so I removed it and went with a solenoid and timer.

Basically the auto-shut-off valve or this setup posted here should be used to conserve water and prevent "waste water" from flowing constantly. The float valve does not stop waste water from flowing (unless your auto-shut-off valve is working properly).
08-17-2006 10:40 PM
Brilliant Why not just buy a .25" solenoid valve?
I have mine wired into a timer....one of many thats left sitting around.

I really love the post DC has over at FellowshipoftheFish. I am revamping my source water system now and its been very helpful although the manual water changes are giving me a workout I needed.

Heres a pic of the splitter I use and the solenoid valve.
08-17-2006 10:32 PM
Ken73 Hi Guys, just out of curiosity, is there an advantage of this setup over using a regular Kent Marine float valve? I've got my trash-can RO setup with a mechanical float valve on it, and it's been doing fine.
07-31-2006 08:28 PM
Naja002
Quote:
Why not a soelenoid valve from an old washing machine ?
That is really too sweet. Never crossed my mind. I may try it just to check it out.
07-30-2006 07:41 PM
jay1st It's like this :

Found here.
07-30-2006 07:34 PM
toofazt
Quote:
Originally Posted by jay1st
Why not a soelenoid valve from an old washing machine ?
I know a lot of people who used it for years.
And it's free !!
How big is a washing machine solenoid?
07-30-2006 04:06 PM
jay1st Why not a soelenoid valve from an old washing machine ?
I know a lot of people who used it for years.
And it's free !!
07-30-2006 03:06 PM
vidiots
Quote:
Originally Posted by toofazt
I needed a automatic shut-off valve for my RO-DI system and it had to be before the water line got to the RO-DI unit. So I decided to see what I could come up with. I went to Wal-Mart and got a Automatic Float Switch ($11.28) in the boating section. Then I went to Lowe's and got a 1'' Sprinkler Valve ($10.92) and a 24V Transformer ($12.97) in the sprinkler section. I already had the pvc pipe fittings (~$6).
Wow, that is a whole lot cheaper than what I spent on the setup for my auto water changer, and for the most part it looks like you got all the same equipment. Nice job!

I really should learn to shop around more when I do these things.
07-30-2006 01:36 PM
scolley Thanks Steve. jay1st confirmed what I wanted to know. I all likelihood this solenoid will only work for moderately pressurized applications.

Which is fine for what you've got it doing. Great work!
07-30-2006 07:14 AM
jay1st
Quote:
But some solenoids, particularly the less expensive ones, use the fluid pressure to switch them somehow. So if you have a fluid that is not adequately pressurized, they won't close all the way.
You're spot on !
Most of the gardening electric valves uses this system.
A solenoid lets a small amout of water (master command) to push a spring loaded piston lifting a rubber membrane (slave) allowing a big flow of water.
Membranes have a tendancy to become porous over time, and the low ph out of the RO/DI will not help.
But it will take a while before it happens.
07-30-2006 04:12 AM
toofazt This solenoid does not use fluid pressure to switch it. It uses the 24V transformer. When there is power to it, the valve opens. When the power is shut off, it closes. I do not think this would work for draining a tank unless you had some sort of pump hooked up to it, which would be pointless because you could just use the pump without the solenoid. Does that answer your question?
07-30-2006 03:10 AM
scolley
Quote:
Originally Posted by toofazt
Whatever your going to have flowing through it does have to be under pressure a little.
Yeah, every liquid has to be under a little pressure to flow through a tube (generally speaking). But some solenoids, particularly the less expensive ones, use the fluid pressure to switch them somehow. So if you have a fluid that is not adequately pressurized, they won't close all the way.

You are using this for an RO system. That's got a good bit of pressure. I ask because some other application, like draining a tank, may not have as much pressure, and this lawn solenoid may not be suitable. So it would be nice to know if you have that info.

Thanks.
07-30-2006 03:01 AM
toofazt I don't know what the inside diameter of the solenoid it. Whatever your going to have flowing through it does have to be under pressure a little. I don't know specifically but it's not too hard to blow through with your mouth when it's engaged.
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