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Old 21 May 2015, 22:34   #11
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Quote:
Originally Posted by jonp View Post
Does anyone know if these are relief valves? (doesn't say in the book)

If the rib is up on the plane how can slightly soft tubes effect performance, surely the tubes are skimming above or only slightly touching the surface?

Sorry for my ignorance Im new to owning a rib and also living in an area they are not popular due to the harsh conditions. This site also states to search for an answer rather than starting a new thread on something already covered.

Jon
The pictured valve is the new Zodiac push-push valve that was introduced in about 2009.

It is only a toggle-able one-way valve. It does not act as a pressure relief valve.

A reduction in tube pressure can cause high frequency oscillations in the tube set which can cause premature wear on the sterns, especially the stern-most perpendicular seam before the cone.

In SIBs, low tube pressure can cause a lack of rigidity in the vessel, which can cause the bow to drag, increasing the friction to the water, and reducing performance.

RIBs aren't affected as much, but you can really trash your tubeset running it underinflated.

Bottom line, check the pressure after putting the boat in the water. It should be 3.5 psi.
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Old 22 May 2015, 00:39   #12
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Thanks for that, I will certainly need to put a little more pressure in then and maybe look at getting some relief valves especially on the black tubes.

Thanks Jon
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Old 22 May 2015, 02:29   #13
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that's an inflation valve Jon in your book or boat spec it will tell you how many chambers your boat has i.e. three chambers three valves if you have relief valves as well not far away from the inflation valves when you take the cap off all you see is a flat rubber mushroom valve which you can not press as the air pushes past it when at the required pressure.
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Old 22 May 2015, 03:06   #14
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Originally Posted by jeffstevens763@g View Post
that's an inflation valve Jon in your book or boat spec it will tell you how many chambers your boat has i.e. three chambers three valves if you have relief valves as well not far away from the inflation valves when you take the cap off all you see is a flat rubber mushroom valve which you can not press as the air pushes past it when at the required pressure.
Thanks mate, Ive got 5 chambers just wasn't quite sure if those small green plastic bits on the end were some sort of release valve (obviously not). The guy I bought the boat off had only done 47 hrs on the water and claimed to of never checked the air pressure since buying it

After checking with the gauge I first thought the gauge must be faulty but after hearing how hard they should be on here when properly inflated I was way under (not even registering on the gauge). Ive just pumped each section up in my garage in cool conditions to 1.5 psi and they now feel very firm, next trip out I will carefully check Im closer to the 3.5psi.

All ribs seem to be hard to get info on over here (apart from this site), I contacted the closest dealer who only gets boats or parts to order and is 5hrs from where I live, he couldn't give me any prices on a 12 volt pump, step ladder, fuel tank size (pretty much everything). Still waiting for him to get back to me (3 weeks). By the way Ive since found a label on my underfloor tank stating 97lt.

Thanks again Jon
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Old 22 May 2015, 03:25   #15
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Quote:
Originally Posted by jonp View Post
Thanks mate, Ive got 5 chambers just wasn't quite sure if those small green plastic bits on the end were some sort of release valve (obviously not). The guy I bought the boat off had only done 47 hrs on the water and claimed to of never checked the air pressure since buying it

After checking with the gauge I first thought the gauge must be faulty but after hearing how hard they should be on here when properly inflated I was way under (not even registering on the gauge). Ive just pumped each section up in my garage in cool conditions to 1.5 psi and they now feel very firm, next trip out I will carefully check Im closer to the 3.5psi.

All ribs seem to be hard to get info on over here (apart from this site), I contacted the closest dealer who only gets boats or parts to order and is 5hrs from where I live, he couldn't give me any prices on a 12 volt pump, step ladder, fuel tank size (pretty much everything). Still waiting for him to get back to me (3 weeks). By the way Ive since found a label on my underfloor tank stating 97lt.

Thanks again Jon
to be honest Jon i can believe he hasn't pumped them up i only do mine once a year mine should be at 3 psi which seems to be the norm apart from high pressure floors there should be a plate showing pressure somewhere on the transom.
zodiac have a good website with all the info you require with costs for all there kit if not there will be info for a dealer near you.i bought a bravo pump over here in the UK cost was about £100 i do know that takakat over in new Zealand sell 12v pumps and ship world wide have a look at them.

cheers jeff
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Old 22 May 2015, 04:54   #16
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Plate states 3.4 but will try for 3 (temp depending), no pricing online here with Zodiac but I get a rough idea going off the UK site.

Jon
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Old 22 May 2015, 05:49   #17
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Every SIB owner unless they are plodding along the river needs a decent pressure gauge. Tubes are generally 3.4 psi and the last 1/2 psi makes all the difference. This is especially true with HP air floor SIB's where inflating to say 9 or 10 when they should be 11.2 to 11.4 means they handle like a wallowly waterbed.

Easy to make a very accurate pressure gauge for a few £'s.

Adapting a pressure gauge for a SIB...
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Old 22 May 2015, 06:46   #18
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inflate to what it says on the plate as a maximum Jon pic of my plate 3 psi

cheers
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Old 22 May 2015, 12:56   #19
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This is the type that I used on my Humber SIB, Took no more than half hour to fit 3 of them.

NEW A 6 Leafield Air Pressure Relief Valve Boat Rib Inflatable Marine Sib PRV C7 | eBay

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Old 22 May 2015, 13:18   #20
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Most Zodiac Products = 240 millibar - 3.48 psi.
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