Arrrrrggghhh V4Tec BOV

Rebreatherlab · 31st May 2007, 12:43

I have just completed building a BOV that uses oring seals on the barrel face. The inside diameter of the breathing bore is 28 mm. The whole thing is considerably more compact than the Kiss, V4tec, Golem and Cis Lunar. WOB is very low and internals are balanced Scubapro G250HP.
This one does hold a pos or negative over night AND is easy to operate.

The spigots OD is 44 mm so, aprat from the Pelagian, it also fits Meg hoses perfect and also Inspiration, Prism and a few others with a bit of stretching.

The flapper valves are Draeger, so they are flat, made for Rebreather use and gives less resistance than 2nd stage exhalation valves.

The mouthpiece plate can be swapped in 2 minutes for another plate with a double oringed p-connector for use with the Draeger Panorama FFM.

The BOV section can be rotated for LP hose on left or right side.

I belive this is now the worlds most compact BOV. It took nearly a year to finalize so I hope there are a lot of BOV hungry divers out there!

Cheers,

Andy

Quote: (Originally Posted by Skipbreather)

Hi Mark-

I’ve built several BOVs with the rotating spool layout and I’ve learned a lot in the process. Here is what is most likely going on:

The EXTERNAL seal- to keep water out of the loop- is the O ring on the spool near whatever serves the function of a face plate/ spool retainer. The gas leaks that cause failure of the neg test occur within the loop- thru the mouthpiece as stated above. A BOV indeed CAN be built to allow a spool type design a decent neg test, but it ain’t easy. I found that the tolerance spool to body has to be in the 0.0005” range- yes 5 ten thousandths of an inch. The final seal is then achieved with lube in the spool to body interface. No O rings involved.

With this tight a clearance my BOV does good +/_ tests, but the spool is not an easy “flick” to twist ala Jetsam. The slight extra effort required to twist a spool vs how other more complex designs function is worth it to me because the internal bore is a LOT larger = lower WOB.

A spool design could be designed gas tight another way as well but would require some pretty exotic milling or molding gear that would allow O ring grooves to be produced on the face of a cylindrical shape. WAAAAAY beyond the capability of my stone age shop…………

Clear as mud, right?

Best,
Ken

Mikel-Deko · 31st May 2007, 13:10

Pictures and price welcome

decoweenie · 31st May 2007, 14:10

Quote: (Originally Posted by Mikel-Deko)

Pictures and price welcome

Pictures already posted on another thread (i.e. Pelagian mod-1).

And the price is similar to the Golem BOV, I was informed.

rogeringebo · 31st May 2007, 16:37

Here are some pics..

/Roger

**RichClark** · 31st May 2007, 17:39

It certainly looks like a nice bit of kit, i don't suppose you'll be adapters to fit the KISS QC's or make your own QC's for KISS hoses?

Cheers

Rebreatherlab · 31st May 2007, 21:06

Hmm, Maybe? I havn't seen a Kiss for ages. Cant the hose cuffs be stretched a bit to go direct on the 44 mm OD BOV spigots? What is the OD of the Kiss QC spigot?

All the best,

Andy

Quote: (Originally Posted by RichClark)

It certainly looks like a nice bit of kit, i don't suppose you'll be adapters to fit the KISS QC's or make your own QC's for KISS hoses?

Cheers

stuey · 1st June 2007, 03:00

I fitted a Golem and it holds a neg test, fantastic piece of kit and a good buy just now with the $ exchange rate.

Mark Wagstaff · 27th June 2007, 02:45

On a recent dive trip we deco'd out at 6m on pure O2. In order to do this I rotated the V4tec BOV to OC and released the loop. I then breathed off an OC reg on the deco bar.
Imagine my surprice then when I flooded my counterlungs because the V4tec does not isolate between the OC and CC sides of the BOV.
Keep this in mind when you are selecting a BOV!
I'm now looking for a new BOV and a FFM t go with it.

Regards,

Rebreatherlab · 28th June 2007, 19:25

Maybe a Panorama with a Pelagian BOV, plus optional panorama adapter plate?

Andy

Quote: (Originally Posted by Mark Wagstaff)

On a recent dive trip we deco'd out at 6m on pure O2. In order to do this I rotated the V4tec BOV to OC and released the loop. I then breathed off an OC reg on the deco bar.
Imagine my surprice then when I flooded my counterlungs because the V4tec does not isolate between the OC and CC sides of the BOV.
Keep this in mind when you are selecting a BOV!
I'm now looking for a new BOV and a FFM t go with it.

Regards,

windymiller · 28th June 2007, 19:31

Has anyone seen the updated v4tec BOV? If you look on their website details of it...hold negative tests now etc

Did email for a price etc, but no reply!

31st May 2007, 12:43	#31 (permalink)
Rebreatherlab RebreatherWorld Sponsor Current Rebreather/s: Pelagian Other Rebreather/s: Not Bought Yet Classic Kiss Pelagian Join Date: Sep 2005 Location: Thailand Posts: 202	Re: Arrrrrggghhh V4Tec BOV I have just completed building a BOV that uses oring seals on the barrel face. The inside diameter of the breathing bore is 28 mm. The whole thing is considerably more compact than the Kiss, V4tec, Golem and Cis Lunar. WOB is very low and internals are balanced Scubapro G250HP. This one does hold a pos or negative over night AND is easy to operate. The spigots OD is 44 mm so, aprat from the Pelagian, it also fits Meg hoses perfect and also Inspiration, Prism and a few others with a bit of stretching. The flapper valves are Draeger, so they are flat, made for Rebreather use and gives less resistance than 2nd stage exhalation valves. The mouthpiece plate can be swapped in 2 minutes for another plate with a double oringed p-connector for use with the Draeger Panorama FFM. The BOV section can be rotated for LP hose on left or right side. I belive this is now the worlds most compact BOV. It took nearly a year to finalize so I hope there are a lot of BOV hungry divers out there! Cheers, Andy Quote: (Originally Posted by Skipbreather) Hi Mark- I’ve built several BOVs with the rotating spool layout and I’ve learned a lot in the process. Here is what is most likely going on: The EXTERNAL seal- to keep water out of the loop- is the O ring on the spool near whatever serves the function of a face plate/ spool retainer. The gas leaks that cause failure of the neg test occur within the loop- thru the mouthpiece as stated above. A BOV indeed CAN be built to allow a spool type design a decent neg test, but it ain’t easy. I found that the tolerance spool to body has to be in the 0.0005” range- yes 5 ten thousandths of an inch. The final seal is then achieved with lube in the spool to body interface. No O rings involved. With this tight a clearance my BOV does good +/_ tests, but the spool is not an easy “flick” to twist ala Jetsam. The slight extra effort required to twist a spool vs how other more complex designs function is worth it to me because the internal bore is a LOT larger = lower WOB. A spool design could be designed gas tight another way as well but would require some pretty exotic milling or molding gear that would allow O ring grooves to be produced on the face of a cylindrical shape. WAAAAAY beyond the capability of my stone age shop………… Clear as mud, right? Best, Ken
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31st May 2007, 13:10	#32 (permalink)
Mikel-Deko Custom Title Allowed! Current Rebreather/s: Inspiration Classic Other CCR Other Rebreather/s: Other CCR Join Date: Jul 2005 Location: Basque Country -Sp- Posts: 452	Re: Arrrrrggghhh V4Tec BOV Pictures and price welcome __________________ Mikel-Deko Basque Country www.olatu.net "DIR is the nanny state for divers who cannot think on their own" Ron Micjan
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31st May 2007, 14:10	#33 (permalink)
decoweenie Crash Test Dummy Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Feb 2005 Location: Cairo Posts: 5,487	Re: Arrrrrggghhh V4Tec BOV Quote: (Originally Posted by Mikel-Deko) Pictures and price welcome Pictures already posted on another thread (i.e. Pelagian mod-1). And the price is similar to the Golem BOV, I was informed. __________________ "...after a while you get bored offering advice to a bull that like to keep butting the fence with its head rather than walking through the open gate..." - Rebreather World PM
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31st May 2007, 17:39	#35 (permalink)
RichClark Classic KISS No. 226 Current Rebreather/s: Classic Kiss Other Rebreather/s: Join Date: Mar 2005 Location: Hove, UK Posts: 778	Re: Arrrrrggghhh V4Tec BOV It certainly looks like a nice bit of kit, i don't suppose you'll be adapters to fit the KISS QC's or make your own QC's for KISS hoses? Cheers __________________ The more I learn about women, the more I want to go diving... just don't tell my wife I said that To taste something a little different, try http://www.thechillikitchen.co.uk
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31st May 2007, 21:06	#36 (permalink)
Rebreatherlab RebreatherWorld Sponsor Current Rebreather/s: Pelagian Other Rebreather/s: Not Bought Yet Classic Kiss Pelagian Join Date: Sep 2005 Location: Thailand Posts: 202	Re: Arrrrrggghhh V4Tec BOV Hmm, Maybe? I havn't seen a Kiss for ages. Cant the hose cuffs be stretched a bit to go direct on the 44 mm OD BOV spigots? What is the OD of the Kiss QC spigot? All the best, Andy Quote: (Originally Posted by RichClark) It certainly looks like a nice bit of kit, i don't suppose you'll be adapters to fit the KISS QC's or make your own QC's for KISS hoses? Cheers
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1st June 2007, 03:00	#37 (permalink)
stuey New Member Current Rebreather/s: Inspiration Vision Other Rebreather/s: Join Date: Aug 2006 Location: Thailand Posts: 49	Re: Arrrrrggghhh V4Tec BOV I fitted a Golem and it holds a neg test, fantastic piece of kit and a good buy just now with the $ exchange rate.
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27th June 2007, 02:45	#38 (permalink)
Mark Wagstaff New Member Current Rebreather/s: Inspiration Classic Megalodon Other Rebreather/s: Join Date: Jun 2005 Location: Australia Posts: 6	Re: Arrrrrggghhh V4Tec BOV On a recent dive trip we deco'd out at 6m on pure O2. In order to do this I rotated the V4tec BOV to OC and released the loop. I then breathed off an OC reg on the deco bar. Imagine my surprice then when I flooded my counterlungs because the V4tec does not isolate between the OC and CC sides of the BOV. Keep this in mind when you are selecting a BOV! I'm now looking for a new BOV and a FFM t go with it. Regards,
(Offline)

28th June 2007, 19:25	#39 (permalink)
Rebreatherlab RebreatherWorld Sponsor Current Rebreather/s: Pelagian Other Rebreather/s: Not Bought Yet Classic Kiss Pelagian Join Date: Sep 2005 Location: Thailand Posts: 202	Re: Arrrrrggghhh V4Tec BOV Maybe a Panorama with a Pelagian BOV, plus optional panorama adapter plate? Andy Quote: (Originally Posted by Mark Wagstaff) On a recent dive trip we deco'd out at 6m on pure O2. In order to do this I rotated the V4tec BOV to OC and released the loop. I then breathed off an OC reg on the deco bar. Imagine my surprice then when I flooded my counterlungs because the V4tec does not isolate between the OC and CC sides of the BOV. Keep this in mind when you are selecting a BOV! I'm now looking for a new BOV and a FFM t go with it. Regards, __________________ www.rebreatherlab.com
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28th June 2007, 19:31	#40 (permalink)
windymiller All The Gear, No Idea Current Rebreather/s: Inspiration Classic Evolution Megalodon Other Rebreather/s: Join Date: Oct 2005 Location: england Posts: 274	Re: Arrrrrggghhh V4Tec BOV Has anyone seen the updated v4tec BOV? If you look on their website details of it...hold negative tests now etc Did email for a price etc, but no reply!
(Online)

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