Pressure relief valve

Roy Smith · 28 January 2008, 19:08

I was thinking of fitting Pressure relief valve
wondered if its a big job as i don't want to damage the tubes
Any thoughts

BogMonster · 28 January 2008, 19:15

I looked at it after my problems and you need access to both the inside and outside of the tube which means opening up a seam to get in, you cut a hole, shove it through and then there is a sort of nut thing which screws onto the inside of the valve to clamp it IIRC. I suppose you could fit the valve to a big patch and then glue that onto the deflated tube but I should think that clamping it to make sure the glue was attached properly, might be easier said than done...

After my efforts at repair and having got an airtight boat I decided not to make any more holes in perfectly serviceable chambers - however my 2 inner sausages have PRV's fitted - by Mr Tilley

I wouldn't buy another RIB without them though, and I can't understand - for the minimal extra cost - why all manufacturers don't fit them to all boats and tubes as standard.

BogMonster · 28 January 2008, 19:22

http://www.tidel.biz/catalogue/Leafi...eliefValve.php

may be worth a chat with Paul

Installation instructions on the Leafield website here

http://www.leafieldmarine.co.uk/valveaA6.htm

codprawn · 28 January 2008, 22:32

I can't believe they aren't fitted to a big RIB like a Scorpion. They are essential unless you want a burst seam. Mine has them on every chamber - tubes made by Paul Tilley.

ribraff · 29 January 2008, 08:02

Pressure relief valves are not always necessary for light coloured tubes in our climate, the main contributing factor is an excess of pressure from sunlight.

thomas · 29 January 2008, 11:26

you can get an aftermarket ceredi part which just screws in to your nonrelief valve already fitted, sits flush.

Chris · 29 January 2008, 19:37

Tom do you have any info about these? a link perhaps?

Chris

thomas · 29 January 2008, 19:46

I will get some info for you tomorrow when im back in at work, I think i may even have one in stock I can take a photo of and show you.

Roy Smith · 29 January 2008, 20:44

Thanks Tom
Any idea on cost

thomas · 29 January 2008, 20:57

I just saw it when the boys were putting away some new stock so just had a look out of intrest so i will check the paperwork when I have to mins and will get back to, It must be only a couple of pounds.

codprawn · 29 January 2008, 21:27

Remember you will need one for each chamber. They sound like a great idea though.

thomas · 29 January 2008, 21:30

Im sure if the craft is going to be used in our weather climits, then having it in the just two chambers would surfice, as it would relieve a small amount of pressure on the baffels to the next chamber, although yes i think you would be right if abroad.

paul tilley · 29 January 2008, 23:13

roy if your rib is a scorpion i would expect it to have leafield valves fitted only option will be to fit leafield a6 valves if you want to do it properly .with a bit of brute force these can be fitted without opening up the tube

Nos4r2 · 29 January 2008, 23:19

Quote:

Originally Posted by Tom

Im sure if the craft is going to be used in our weather climits, then having it in the just two chambers would surfice, as it would relieve a small amount of pressure on the baffels to the next chamber, although yes i think you would be right if abroad.

Just a personal opinion but I'd fit one on each chamber-it's a scorp, why do things by halves? The boat certainly doesn't

Besides, it's always better to cover your back.

Nos4r2 · 29 January 2008, 23:24

Quote:

Originally Posted by paul tilley

roy if your rib is a scorpion i would expect it to have leafield valves fitted only option will be to fit leafield a6 valves if you want to do it properly .with a bit of brute force these can be fitted without opening up the tube

Out of interest Paul,(and the fact that I've got some a6 valves and spare hypalon in my garage)

How would you do it? With the valve bolted to a patch-and what thickness hypalon for the patch? How would you get the pressure to get the glue to seal (particularly when there's a load of armour on my tubes so they aren't very flexible)

codprawn · 30 January 2008, 01:07

Quote:

Originally Posted by Tom

Im sure if the craft is going to be used in our weather climits, then having it in the just two chambers would surfice, as it would relieve a small amount of pressure on the baffels to the next chamber, although yes i think you would be right if abroad.

If you use common sense and constantly keep adjusting pressures then you don't really need them but I have light coloured tubes and the difference in pressure on our odd hot days last summer was scary - they definitely stop you worrying. Especially when I saw a RIB split a seam 2 years ago.

pathalla · 30 January 2008, 01:36

I replaced all nine pressure relief valves on my rib two years ago, seems they were about 30 dollars apiece for the mil-spec units used on these (Demaree) sponsons, just wondering what they might cost in the U.K.?

Limey Linda · 30 January 2008, 01:52

I have a pinhole leak somewhere?? As my tubes are red and I can get air temp swings up to 40 degrees. F in 24 hours I think I am not going to find and fix the leak. It only takes me 10 mins to top off the tubes. I have a built in relief system. I am sure there are leaks between the chambers as it all balances out.

thomas · 30 January 2008, 08:15

Quote:

Originally Posted by Nos4r2

Just a personal opinion but I'd fit one on each chamber-it's a scorp, why do things by halves? The boat certainly doesn't

Besides, it's always better to cover your back.

#

Yes good point, common sense, which I didnt seem to have last night, when writing my commment! I will have a look today and find out prices, how many are in stock and get a picture aswell.

thomas · 30 January 2008, 10:19

http://translate.google.com/translat...A_enGB244GB244

if you look at this page it has a listing, its red on their website.