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Topic: Water non return valve

vulpecula

11/6/2007 at 9:30am
Location: Stafford
Outfit: Toyota Surf + Swift Corniche

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I have a 2001 Swift Corniche 15/2 and the non return valve on the system appears not to be fully working. After being left say for the day or overnight the water system has to be reprimed. It went in for a service last month and this problem was pointed out, on collection I was told that the system had been checked and was ok. Just been away and the system is not ok.....so much for servicing! My problem is how do you get the water system pipes apart. I have been told they are push fits, if so the ones on my system are very very tight. Any ideas how to get the joints apart?

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A mystery of life - why do learner drivers always learn in front of you?

guy-rope

11/6/2007 at 9:39am
Location: North east
Outfit: lots of tents and other kit

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Usually on household plumbing systems , a push fit joint has a little collar sticking out of it where the pipe goes in ,.If you push this in with a suitable tool such as adjustable wrench the pipe can be pulled out then because it slackens the grab mechanism inside . I would imagine caravan push fits are the same in operation .

Harpmaker

11/6/2007 at 11:16am
Location: Auckland New Zealand
Outfit: Toyota Hiace conversion

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guy rope is right. push the pipe towards the connection and use your finger to hold the centre "collet" into the end of the pipe and the whole thing should more or less slide off. Refitting is a reverse, push the pipe on and pull back slightly to lock the collet onto the connector.

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Alan in New Zealand

michael

11/6/2007 at 10:56pm
Location: Lancashire
Outfit: Caravan now Sold

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there could be a split in the pump pipe letting air in and causing an air lock.

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the only silly question is the one you do not ask.

vulpecula

12/6/2007 at 9:11am
Location: Stafford
Outfit: Toyota Surf + Swift Corniche

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Thanks for the advice will try again.

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A mystery of life - why do learner drivers always learn in front of you?

Davembk

12/7/2015 at 4:37pm
Location: Reading
Outfit: Abbay Iona Vogue caravan

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Hi vulpecular,

10 years on, I have this problem!
Was sceptical that a new nrv would work ie push fit, without some pre-force eg spring loading or high water back pressure. It didn't! The hot water tank still syphoned out albeit as always, slowly but a real pain.

A test I did, was fill my new, uninstalled nrv,vertically, from a tap in the non return direction, watch it leak, until I assisted it by pressing into it with eg an allen key, no leak now.

So the push fit nrv is pointless, the actual non return action is at the water inlet, spring loaded, and when I finally worked this out and fixed the o ring there, all was well. So forget relying on push fit nrv's,they are useless.

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Dave

jeff juke

12/7/2015 at 6:49pm
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How do you know it is the non return valve for certain ? As Michael has said it might be a split in the pump ? Could be other things like your pump is needing a new washer on it ?

One of the symptoms of being the non return valve is,when you run the hot water tap it has pressure then flows at a dribble is this happening ? If not i would check other alley ways before you give yourself work for nothing.

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Animals have feelings..

JEFF................

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