instead of an H-valve

[rjchandler]

instead of an H-valve, how about this? Anyone seen one?Do they have a double diop tube?
www.divecochran.com/beuchat/accessories/valves/index.htm

 

[scubasrm2]

Looks like a Y valve to me.
Still 1 burst disc and 1 O-ring.

 

[Diver0001]

instead of an H-valve, how about this? Anyone seen one?Do they have a double diop tube?
www.divecochran.com/beuchat/accessories/valves/index.htm

My 15L tank has a valve like this. It's a Y valve. You can close down the posts independently like doubles making the neck o-ring the weakest link instead of the regulator (hence their popularity where the water is really cold). I find it a little easier to get at than an H valve when I'm wearing my drysuit.

You can get them for 232 and 300 bar tanks.

R..

 

[bottomrunner]

but you still do not have a redundant air supply
as Diver0001 has stated
what if the o ring that holds h, or y. valve to tank fails
shutting of one reg will do nothing to solve problem

 

[wedivebc]

instead of an H-valve, how about this? Anyone seen one?Do they have a double diop tube?
www.divecochran.com/beuchat/accessories/valves/index.htm

I have never seen a dip tube plug but I have seen a tank neck o ring blow a couple of times. Both times happened right after filling. There is a loud pop then a louder hissing noise as all the air escapes. Having 2 seperate regs won't help you there.

 

[John C. Ratliff]

How about we start using this valve, but with a 1/2 inch tapered thread on the tank rather than the current 3/4 inch, and teflon tape That way, we could really go back to the ol' days, and have total redundancy. Anyone seen some old 20-man life raft bottles I could re-thread (like we used to do).

SeaRat

PS--I have never seen a tank O-ring rupture (the one at the neck of the valve) while the tank was in the water (or on land for that matter). Anyone else seen this?

 

[bottomrunner]

PS--I have never seen a tank O-ring rupture (the one at the neck of the valve) while the tank was in the water (or on land for that matter). Anyone else seen this?[/QUOTE]

Hi sea rat
I have seen 6 tank o-rings go under water.
I have also see a tank that was bubbling through the metal about 3 inches below the valve. Yes I aborted the dive and failed the tank, on the spot.
I think the main reason you have not seen a o-ring blow is because they were changed when they were noticed that they were starting to fail, while the tank was being filled by your local dive shop.
However the o-rings seems to blow at a lower tank presures
and only bubbles at higher pressure.
I have also had tank o-rings blow while I was filling them.
Also have had a few burst disks blow while I was filling them.
The burst disks failed well below the working presure of the valve.
Nothing lasts forever.
It is now a matter of IF they will fail but WHEN.
Same as the high pressure seat in your first stage
Hopes this helps

 

[CRDiver]

A couple years ago, I called a Beuchat dealer and they quoted me $179 per valve... I bought my Thermo Pro H-valves for $50 each from Andy @ Aquatic Discount Scuba. Unless they are worth 3 times the price of a standard h-valve - or you get get them dirt cheap - they're not worth the price.