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Subject Topic: Water non return valve Post Reply Post New Topic
Personvulpecula
11/6/2007 at 9:30am
 Location: Stafford
 Outfit: Toyota Surf + Swift Corniche View vulpecula's Profile View Profile   Reply to vulpecula Reply   Quote vulpecula Quote  
Joined: 23/3/2006

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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?


Personguy-rope
11/6/2007 at 9:39am
 Location: North east
 Outfit: lots of tents and other kit View guy-rope's Profile View Profile   Reply to guy-rope Reply   Quote guy-rope Quote  
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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 .



PersonHarpmaker
11/6/2007 at 11:16am
 Location: Auckland New Zealand
 Outfit: Toyota Hiace conversion View Harpmaker's Profile View Profile   Reply to Harpmaker Reply   Quote Harpmaker Quote  
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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


Personmichael
11/6/2007 at 10:56pm
 Location: Lancashire
 Outfit: Caravan now Sold View michael's Profile View Profile   Reply to michael Reply   Quote michael Quote  
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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.


Personvulpecula
12/6/2007 at 9:11am
 Location: Stafford
 Outfit: Toyota Surf + Swift Corniche View vulpecula's Profile View Profile   Reply to vulpecula Reply   Quote vulpecula Quote  
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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?


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PersonDavembk
12/7/2015 at 4:37pm
 Location: Reading
 Outfit: Abbay Iona Vogue caravan View Davembk's Profile View Profile   Reply to Davembk Reply   Quote Davembk Quote  
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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


Personjeff 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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