Plumbing Oppos advice needed

"DipodomysDeserti" (dipodomysdeserti) 04/25/2018 at 14:27 • Filed to: None

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I’m setting up a grey water system for my washing machine. I’m installing a vacuum break so the grey water drain doesn’t act like a siphon when my washer is filling. Which way should the arrow point on my check valve? I’m assuming down (towards the drain) so that it provides some positive pressure during filling. Just want to double check. Pictured is my vacuum break. The drain will run along the bottom of the T fitting. There will be another pipe section connected to the open end on the T. Thanks!

benjrblant > DipodomysDeserti 04/25/2018 at 14:32

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In a check valve, flow is only allowed in the direction of the arrow.

vicali > DipodomysDeserti 04/25/2018 at 14:36

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Arrow points with flow,

Here’s my check valve for the black tank spray on my RV; That straight through one in the back is the check valve.

HondoyotaE38: A Japanese and German Collab...wait a minute > DipodomysDeserti 04/25/2018 at 14:36

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PLEASE SHARE THIS TO OPPO AS A POST. KINJA IS REALLY BROKEN AND LOOKS WEIRD AND I CANT MAKE ANY POSTS AND ITS VERY UNSETTLING. PLEASE HELP.

DipodomysDeserti > vicali 04/25/2018 at 14:55

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So I should have it pointed towards the “T” as I don’t want drainage flowing out of the vacuum break. This vacuum break is being used to create back pressure, rather than to prevent backflow.

DipodomysDeserti > benjrblant 04/25/2018 at 15:06

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Yes, and I don’t want water flowing out of a vacuum break, right?

vicali > DipodomysDeserti 04/25/2018 at 15:08

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Yep, you want air to come through the vacuum break and then down the line.. You are trying to break the vacuum and have water flow down the drain.

DipodomysDeserti > vicali 04/25/2018 at 15:27

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Got it, thanks. The guy had it backwards in the tutorial I was using, and I wanted to make sure he wasn’t using some sort of plumbing wizardry.