Pressure release valves.

flooky · 14 May 2009, 12:21

can you get something that fits into existing valves that will release the pressure?
ie a new valve core ,or do the existing valves have to be replaced..?
ta..flooky

jyasaki · 14 May 2009, 17:03

Existing doesn't get replaced; new PR valves are added in addition.

jky

flooky · 01 June 2009, 12:48

cheers ...

BogMonster · 02 June 2009, 01:07

I invented just such a thing to fit onto an existing valve, sent the idea to Leafield and heard absolutely eff all in response.

Nasher · 02 June 2009, 11:52

Quote:

Originally Posted by BogMonster

I invented just such a thing to fit onto an existing valve, sent the idea to Leafield and heard absolutely eff all in response.

Ah, but come on Stephen.
It's not possible for everyone to have a highly trained Penguin with a stick stationed on ther boat all the time, and the fish bill would be a bit steep too.

Nasher

BogMonster · 03 June 2009, 00:49

That was the first design but the bugger kept pecking holes in the tubes and I had enough bloody leaks already!

Version two was a pressure relief valve built into a replacement cap, the idea being that you screw on the airtight cap which presses in the valve, and there is a blowoff valve built into the cap which operates above whatever pressure you wanted. It was more of a concept than a detailed design though I did a drawing based on a technical drawing of an existing Leafield valve, but it should have been perfectly possible to make.

I suppose they wouldn't want to sell just one product for each chamber when all the mugs that want them currently buy two separate ones ... my idea is the Wash n Go 2 in 1 of rib tubes, why take 2 bottles into the shower

Apherel · 03 June 2009, 02:18

I had this idea of rigging up an octopus sort of device with tubes running to each value and all connected up to a single pressure release valve. The concept was to rig this up when leaving the boat in dry storage. I tried to see if bits were available from Halkey-Roberts and got a stiff reply that they wouldn't give any advice on any modifications to their product. The automatic tube pressure inflation devices must have something similar, at a squillion times the price, so it must be feasible.

In the end it was easier just to let the pressure out for storage - and get release values in the new boat!

chewy · 03 June 2009, 06:33

I haven't seen one but I would imagine a normal relief for a RIB works the same as any other, ie a diaphragm with a spring behind it, nout complex.

Apherel · 03 June 2009, 06:37

It's the cutting 5 holes in the tubes that's the off putting bit - and the labour cost if its not done when the tubes are made!

Bigmuz7 · 03 June 2009, 06:48

Yeah cos I think they have a backing to them (well mine seem to) so I suppose they have to be fitted when the tubes are made, unless you can push the back through the hole, and glue it, and the front piece screws on to it to compress it together

Nasher · 03 June 2009, 12:01

I'd imagine they are supplied in a similar way to a complete replacement inflation valve, with a circular patch of material already attached.

When I've replaced valves like this all you do is cut around the old valve with a sharpe knife, and glue the new patch with new valve in the middle over the hole. It can be a bit awkward, but having done it a few times it doesn't scare me any more.

If the PRV didn't come with a patch already it would of course be easy to cut one and fit the valve to it before gluing it down over a cut hole.

Nasher.

BogMonster · 04 June 2009, 00:16

That's what I understand - as described by Nasher they are supplied on a patch and you stick it over a hole. Installation of the valve without this would require access inside the tube which means opening up a seam.

Chris · 04 June 2009, 06:56

I had 5 retro fitted by Henshaw and they have a way of doing it without using a patch so they look like they were fitted at new.

£18 ea fitted I think it cost me.

BogMonster · 06 June 2009, 12:29

Quote:

Originally Posted by Chris

I had 5 retro fitted by Henshaw and they have a way of doing it without using a patch so they look like they were fitted at new.

£18 ea fitted I think it cost me.

Blimey - they were something like £45 each as an option on a new boat when I was looking at one a few years back so thats good!

Chris · 06 June 2009, 12:46

Quote:

Originally Posted by BogMonster

Blimey - they were something like £45 each as an option on a new boat when I was looking at one a few years back so thats good!

Henshaws rock