HELP! Air inlet valves for water storage?

[5Runner]

I am working on my water storage design. I am ordering custom tanks for a pump system. I need a one-way valve that will not allow water to spill out, but will allow air in. With out this, I can't pump water out.

For some stupid reason, I cannot find a simple one-way air valve online. Am I going crazy? I have searched every term I can come up with. I do not know why this is so hard.

Please help.

 

[keezer37]

Perhaps, Air Admittance Valve. Mostly for home plumbing but maybe you can find something to suit your needs with that search criteria.

 

[Herbie]

Try searching for the term "check valve", might be more what you're looking for.

 

[Ted_Z]

Do you even need a valve? Just use a length of tubing and run it 1' or so above the top of the tank.

 

[Hill Bill E.]

Do you even need a valve? Just use a length of tubing and run it 1' or so above the top of the tank.

This, if you can swing it. And top it off with a mini air filter, to keep dust/bugs/etc. out.

Otherwise, a check valve will work just fine. Just be sure and follow the directions, some will not work horizontally.

 

[JackW]

US Plastic has a wide variety of check valves

http://www.usplastic.com/catalog/default.aspx?catid=489&parentcatid=870

 

[Mark Harley]

You need an AAV Air Admittance Valve used in Plumbing to vent drains. "New term for expensive air valve"

Old school version
I have several PRO-VENT ABS units in my home for venting air into the system.
"Like a reverse check valve air in no fluid out"
They have a 1 1/2" thread and cost around $5.00 around here.

http://mobilehomepartsstore.com/Mer...581_a_7c1905&gclid=CKPw_san1a4CFQQRNAodxjqPcw