Does such a valve exist? (water check valve)

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A user is seeking a specialized valve that allows water flow in one direction under low pressure but closes when pressure ceases, while also permitting air to enter the system downstream. This valve should prevent water from escaping when active but allow for venting when inactive, facilitating quick drainage. Suggestions include considering an atmospheric vacuum breaker as a potential solution. The user is encouraged to provide a sketch for better clarity on the system design. The discussion highlights the need for a unique combination of check and air admittance valve functionality.
Timscmitt
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Hi folks,

I am looking to solve a small issue.

It requires a 'valve' that will permit water travel in one direction whilst under low active pressure but which closes upon cessation of said pressure. Fair enough....but when closed I would like it to allow air into the system (downstream of the 'check valve') in such a way that when livened again water cannot escape through the 'venting arrangement.' So when live the valve is open but closed to the environment. When not live the valve closes and 'vents' the downstream aspect to the environment thus ensuring quick natural emptying of that pipe. The distance from the 'valve' to terminal pipe fitting is 100mm .

So its a kind of check valve/air admittance valve all in one and in 1/2".

Any help with this little quest would be most appreciated.

Have a great weekend!!
 
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Could you upload a sketch to help clarify the system? Use the "Attach files" link below the Edit window to upload a PDF or JPEG version of your sketch. Thanks.
 

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