BOV +/- Tests

colinicky · 18th April 2006, 19:42

Following on from another thread .I was under the impression that if you bailout then the loop is "TOTALLY" sealed ,therefore when you do a +/- test simply suck /blow like hell ,turn bailout switch & thats it loop sealed .
Is this how it should work in theory but the real doesn't work out or are the BOV's never built to seal completly ?

***diverklondike*** · 18th April 2006, 19:53

Quote: (Originally Posted by colinicky)

Following on from another thread .I was under the impression that if you bailout then the loop is "TOTALLY" sealed ,therefore when you do a +/- test simply suck /blow like hell ,turn bailout switch & thats it loop sealed .
Is this how it should work in theory but the real doesn't work out or are the BOV's never built to seal completly ?

I am in total agreement and expect my new Golem BOV to handle the both with no issue...

I will find out first hand in about 10 days...

Dive Safe...

Mark

**nigelh** · 18th April 2006, 21:08

Quote: (Originally Posted by colinicky)

Following on from another thread .I was under the impression that if you bailout then the loop is "TOTALLY" sealed ,therefore when you do a +/- test simply suck /blow like hell ,turn bailout switch & thats it loop sealed .
Is this how it should work in theory but the real doesn't work out or are the BOV's never built to seal completly ?

With the Bob DSV you get an air feed or a leak as the gate turns and both halves are on stream for a moment. I can get enough to know if it's leaking but not the impressive total crumple some people get.

divetheworld · 18th April 2006, 21:31

Quote: (Originally Posted by nigelh)

With the Bob DSV you get an air feed or a leak as the gate turns and both halves are on stream for a moment. I can get enough to know if it's leaking but not the impressive total crumple some people get.

I close the flow stop, vent the reg and then do the neg test. Works fine.
Pos is simpler, use the manual add with the DSV closed.

Brent.

Janos · 18th April 2006, 21:34

Quote: (Originally Posted by nigelh)

With the Bob DSV you get an air feed or a leak as the gate turns and both halves are on stream for a moment. I can get enough to know if it's leaking but not the impressive total crumple some people get.

I don't know how the Bob works, but with the KISS DSV I turn the knob whilst sucking in continously. I would have thought this would be possible with the Bob?

Janos

colinicky · 18th April 2006, 21:39

Janos
I would agree that this should be possible .My question relates more to the fact that once you turn the knob that should seal the loop but from another thread it would appear that this may not be the case & that air is leaking from the oc to the cc side of the BOV & vice versa

pchanning · 18th April 2006, 21:48

Its down to tolerances, being the quality of the machining. A + and - test is done on my Divematics by rotating the barrel through 90 degrees, and its holds. If the LP hose isn't connected, it wont.

The KISS BOV works differently as it pushes a telescopic tube through the BOV (from front to back - at least it does on the newer ones) from the reg to the mouthpiece. This means you can flush through the complete loop whilst OC. A nice feature. My friend's one seems to leak though.

The Divematics severs the loop, but you can fit whatever reg you like! Pesonally, I'd rather have a top reg and get used to it. Sometimes I get a slight passing, but nothing to worry about. In use its all at ambient which makes this less of an issue.

HTH
Paul

Nick uk. · 18th April 2006, 22:06

I can't get a negative with my BOB, it inflates as soon as i turn the knob!

But then again, my ADV leaks too, and my 'Y' for the fourth cell, holder!!!!!

18th April 2006, 19:42	#1 (permalink)
colinicky Custom Title Allowed! Current Rebreather/s: Inspiration Vision Other Rebreather/s: Inspiration Classic Join Date: Mar 2005 Location: uk Posts: 667	BOV +/- Tests Following on from another thread .I was under the impression that if you bailout then the loop is "TOTALLY" sealed ,therefore when you do a +/- test simply suck /blow like hell ,turn bailout switch & thats it loop sealed . Is this how it should work in theory but the real doesn't work out or are the BOV's never built to seal completly ? __________________ Colin I trust my rebreather completely , I just don't trust the user onwards & downwards
(Offline)

18th April 2006, 19:53	#2 (permalink)
*diverklondike* Moderator Current Rebreather/s: Inspiration Classic Other CCR Other Rebreather/s: Inspiration Classic Other CCR Join Date: Oct 2005 Location: Delaware, USA Posts: 1,552	Re: BOV +/- Tests Quote: (Originally Posted by colinicky) Following on from another thread .I was under the impression that if you bailout then the loop is "TOTALLY" sealed ,therefore when you do a +/- test simply suck /blow like hell ,turn bailout switch & thats it loop sealed . Is this how it should work in theory but the real doesn't work out or are the BOV's never built to seal completly ? I am in total agreement and expect my new Golem BOV to handle the both with no issue... I will find out first hand in about 10 days... Dive Safe... Mark
(Offline)

18th April 2006, 21:08	#3 (permalink)
nigelh New Member Current Rebreather/s: Inspiration Vision Other CCR Other Rebreather/s: Inspiration Classic Other CCR Join Date: Mar 2005 Location: Brighton, Sussex, UK Posts: 821	Re: BOV +/- Tests Quote: (Originally Posted by colinicky) Following on from another thread .I was under the impression that if you bailout then the loop is "TOTALLY" sealed ,therefore when you do a +/- test simply suck /blow like hell ,turn bailout switch & thats it loop sealed . Is this how it should work in theory but the real doesn't work out or are the BOV's never built to seal completly ? With the Bob DSV you get an air feed or a leak as the gate turns and both halves are on stream for a moment. I can get enough to know if it's leaking but not the impressive total crumple some people get. __________________ nigelh
(Online)

18th April 2006, 21:31	#4 (permalink)
divetheworld Dive porn pimp Current Rebreather/s: Inspiration Classic Other CCR Other Rebreather/s: Not Bought Yet Inspiration Classic Inspiration Vision Classic Kiss Other CCR Join Date: Mar 2005 Location: Leeds, England Posts: 1,551	Re: BOV +/- Tests Quote: (Originally Posted by nigelh) With the Bob DSV you get an air feed or a leak as the gate turns and both halves are on stream for a moment. I can get enough to know if it's leaking but not the impressive total crumple some people get. I close the flow stop, vent the reg and then do the neg test. Works fine. Pos is simpler, use the manual add with the DSV closed. Brent. __________________ Self praise is no reccomendation. Dont try to be a great man, just be a man and let history be the judge of you. CHECK OUT OUR INTERWEBS FOR CUSTOM REBREATHER UPGRADES *WWW.NARKEDAT90.CO.UK* *http://www.grpservices.com/pursuit/* Supporting Shearwater Research Products in Europe
(Offline)

18th April 2006, 21:34	#5 (permalink)
Janos "Two Sheds" Current Rebreather/s: Classic Kiss Other Rebreather/s: Classic Kiss Join Date: Feb 2005 Location: East Surrey Posts: 594	Re: BOV +/- Tests Quote: (Originally Posted by nigelh) With the Bob DSV you get an air feed or a leak as the gate turns and both halves are on stream for a moment. I can get enough to know if it's leaking but not the impressive total crumple some people get. I don't know how the Bob works, but with the KISS DSV I turn the knob whilst sucking in continously. I would have thought this would be possible with the Bob? Janos __________________ You can lead a horse to water but you can't climb a ladder with a large bell in both hands - Vic Reeves www.hellfins.com/shed
(Offline)

18th April 2006, 21:39	#6 (permalink)
colinicky Custom Title Allowed! Current Rebreather/s: Inspiration Vision Other Rebreather/s: Inspiration Classic Join Date: Mar 2005 Location: uk Posts: 667	Re: BOV +/- Tests Janos I would agree that this should be possible .My question relates more to the fact that once you turn the knob that should seal the loop but from another thread it would appear that this may not be the case & that air is leaking from the oc to the cc side of the BOV & vice versa __________________ Colin I trust my rebreather completely , I just don't trust the user onwards & downwards
(Offline)

18th April 2006, 21:48	#7 (permalink)
pchanning PFO free :) Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Feb 2005 Location: fixed! Posts: 454	Re: BOV +/- Tests Its down to tolerances, being the quality of the machining. A + and - test is done on my Divematics by rotating the barrel through 90 degrees, and its holds. If the LP hose isn't connected, it wont. The KISS BOV works differently as it pushes a telescopic tube through the BOV (from front to back - at least it does on the newer ones) from the reg to the mouthpiece. This means you can flush through the complete loop whilst OC. A nice feature. My friend's one seems to leak though. The Divematics severs the loop, but you can fit whatever reg you like! Pesonally, I'd rather have a top reg and get used to it. Sometimes I get a slight passing, but nothing to worry about. In use its all at ambient which makes this less of an issue. HTH Paul __________________ Cheers Paul The key to enlightenment... is survival.
(Offline)

18th April 2006, 22:06	#8 (permalink)
Nick uk. Made in England. Current Rebreather/s: Inspiration Classic Azimuth Other Rebreather/s: Azimuth Join Date: Nov 2005 Location: Viale C.Colombo 75 Marina di Carrara. MS 54036 Italy Posts: 579	Re: BOV +/- Tests I can't get a negative with my BOB, it inflates as soon as i turn the knob! But then again, my ADV leaks too, and my 'Y' for the fourth cell, holder!!!!! __________________ If it aint broke....don't fix it, and if it is.............well......get another one! divechief2000@hotmail.com
(Offline)

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode