Rebreather World - View Single Post

silent running · 13th March 2008, 17:16

Quote: (Originally Posted by Rebreatherlab)

Hi Andy,

The problem is that there are not so many Prisms out there to make it viable to make a new design.

Having said that it would be interesting to see a Prism DSV with cages (if used) and the flappers. I doubt WOB breathing would be that much of a difference as the Draeger flappers are also flat. The main difference lies in flat vs. standard exhaust valves as they are designed to excert a small force againts the flow direction where as the flat valves do not. Theoretically the thinner and larger diam. the better, but if the larger diam. flappers are larger than the hose diam. it will not make much difference. What is the inside hose diam. on the Prism?

If I had all the pieces in front of me and it would be possible to only change the inside of the Pelagian BOVs spigot bore I could do it for only a few orders and not need to charge extra for it. If the outside spigot size have to be made larger then quite a few changes in the machine code would be needed and then it would not be worth it unless charging extra and that extra would be significant, I am afraid.

Maybe wait for Oceanic? They might work up a BOV for the Prism 2?

Andy

Hi Andy, thanks for the post. I know we have discussed this before, but the more I thought about plunking down another $1000 for a BOV that may not breathe as well my stock DSV, the harder it was to part with the money.

I'll measure the inside hose diameter and the flapper cage, maybe take a picture of them too. It would be good to know once and for all if it's possible to adapt your BOV to the Prism.

I wish Oceanic would work up a BOV for the Prism 2 as I think it would be a major selling point, but nobody's mentioned such a thing yet... -Andy

13th March 2008, 17:16	#5 (permalink)
silent running Mature mouth breather Current Rebreather/s: Prism Topaz Other Rebreather/s: Join Date: Jun 2005 Location: U.S.A. Brooklyn, New York Posts: 1,832	Re: Prism and Drager flapper valves... Quote: (Originally Posted by Rebreatherlab) Hi Andy, The problem is that there are not so many Prisms out there to make it viable to make a new design. Having said that it would be interesting to see a Prism DSV with cages (if used) and the flappers. I doubt WOB breathing would be that much of a difference as the Draeger flappers are also flat. The main difference lies in flat vs. standard exhaust valves as they are designed to excert a small force againts the flow direction where as the flat valves do not. Theoretically the thinner and larger diam. the better, but if the larger diam. flappers are larger than the hose diam. it will not make much difference. What is the inside hose diam. on the Prism? If I had all the pieces in front of me and it would be possible to only change the inside of the Pelagian BOVs spigot bore I could do it for only a few orders and not need to charge extra for it. If the outside spigot size have to be made larger then quite a few changes in the machine code would be needed and then it would not be worth it unless charging extra and that extra would be significant, I am afraid. Maybe wait for Oceanic? They might work up a BOV for the Prism 2? Andy Hi Andy, thanks for the post. I know we have discussed this before, but the more I thought about plunking down another $1000 for a BOV that may not breathe as well my stock DSV, the harder it was to part with the money. I'll measure the inside hose diameter and the flapper cage, maybe take a picture of them too. It would be good to know once and for all if it's possible to adapt your BOV to the Prism. I wish Oceanic would work up a BOV for the Prism 2 as I think it would be a major selling point, but nobody's mentioned such a thing yet... -Andy
(Offline)