electrnic shut off vavle

[madmax7774]

I have been searching high and low for a valve that requires electric current to stay open. The idea being that by installing it into my plumbing system, it acts as a failsafe. This way if the power goes out, the valve snaps shut and a backward siphon catastrophe is averted. I find it hard to beleive that this doesn't exist, and was wondering if anyone has something that does this??? I did find something sort of like this for the lawn and garden industry that has an electric valve, but not enough information is given about these valves to be sure it does what I think it does.

[johnnybv]

I have been searching high and low for a valve that requires electric current to stay open.  The idea being that by installing it into my plumbing system, it acts as a failsafe.  This way if the power goes out, the valve snaps shut and a backward siphon catastrophe is averted.  I find it hard to beleive that this doesn't exist, and was wondering if anyone has something that does this???  I did find something sort of like this for the lawn and garden industry that has an electric valve, but not enough information is given about these valves to be sure it does what I think it does.

55295[/snapback]

 

I have the valve that may help, it is part of an electronic top off / RO shut off system that I am developing. I also have the valve separate, it only has a 1/4" connection. You can also look at irrigation valves, they usually run on 14v and close when power is out.

john

[steveoutlaw]

Sounds like you need a checkvalve or backflow preventer.

[ErikS]

They exist, check McMaster Carr. What you're looking for is a solenoid, in your case you want one that is NC (normally closed, only open with power).

 

Can't say how long/well it will hold up under constant current (it's ON all the time).

 

Generally folks use a mechanical check valve for this application....but that's an additional point of failure (all things mechanical fail eventually).

[Guest Ominojacu]

I have been searching high and low for a valve that requires electric current to stay open.  The idea being that by installing it into my plumbing system, it acts as a failsafe.  This way if the power goes out, the valve snaps shut and a backward siphon catastrophe is averted.  I find it hard to beleive that this doesn't exist, and was wondering if anyone has something that does this???  I did find something sort of like this for the lawn and garden industry that has an electric valve, but not enough information is given about these valves to be sure it does what I think it does.

55295[/snapback]

 

Yes it's called a solenoid valve, you can probably find one on Marine depot. If you looking to save money, keep an eye out for old washing machines, they have one or two usually.

[traveller7]

Yes it's called a solenoid valve,

55303[/snapback]

A "normally closed" solenoid valve in particular. This one will open when power is applied.

 

A "normally open" will close when power is applied.

 

Aquatic Ecosystems is another source with a good selection.

[rioreef]

ValveStore.com

 

From their web site: water application 2 way solenoid valves for 1" line range in price from $200 to $1200. Watch for the construction material of the valve, many are brass.

 

Check valve and/or drill anti-siphon holes at top of drains and returns about 1" below water surface is a much cheaper solution. Clean the anit-siphon holes regularly and they work!