Leaky ADV.

Nick uk. · 20th March 2006, 23:03

I've got a leaky ADV.....

When trying a neg test, air leaks in from the ADV as i suck out the air, in both the open and shut position, the weird thing is it doesn't leak when under preasure, i striped it cleaned and greased it, put it back together, and it still leaks.

Another strange thing is that if i unscrew the nut that holds it to the 'T', it doesn't leak, when i bolt it down it leaks again?????

Any ideas..... i 'thought' i was going diving tommorow.

RebreatherDave · 22nd March 2006, 04:45

I was on a dive when I had a dil leak at the swivel that attaches to the side of the AP ADV. It took awhile to reach back, but finally after much contortion I slid the barrel on the shutoff and then went to manual dil addition the rest of the dive.

I took off the swivel and replaced the o-ring on the side with a Viton one lubed with Christo-Lube, but it still leaded. Ends up being the tiny o-ring in the end of the hose that screws into the swivel opening.

Someone shouuld make a sliding barrel shutoff where the barrel does not interfere with the side of the corrugated hose collar as the one I now have does.

pabusk · 22nd March 2006, 07:53

Hi Nick,

It sounds logical that the ADV doesn't leak under pressure as you close the internal valve like when you ambient pressure in your lungs when diving. This valve opens when your lungs get flat like a second stage.

So if you do a negative test the valve opens also ... this then introduces you shutoff valve ... hose ... manifold ... every hose on the dilluent side of the manifold and you dilluent first stage to the system. Are you sure it's the ADV giving the problems.

Try a negative test with the shutoff valve closed ... if it still leaks the you at least isolated all of the other things

Paul

Nick uk. · 22nd March 2006, 08:47

Quote: (Originally Posted by pabusk)

Hi Nick,

It sounds logical that the ADV doesn't leak under pressure as you close the internal valve like when you ambient pressure in your lungs when diving. This valve opens when your lungs get flat like a second stage.

So if you do a negative test the valve opens also ... this then introduces you shutoff valve ... hose ... manifold ... every hose on the dilluent side of the manifold and you dilluent first stage to the system. Are you sure it's the ADV giving the problems.

Try a negative test with the shutoff valve closed ... if it still leaks the you at least isolated all of the other things

Paul

It leaks in both open amd closed position. I've ordered a set of O rings to change tem all out, on visual inspection they all seemed to be ok, the only ones i didn't take out to check are the two on the inside of the barrel, will do that when the new set arrive.

Nick uk. · 22nd March 2006, 08:50

Quote: (Originally Posted by pabusk)

Hi Nick,

It sounds logical that the ADV doesn't leak under pressure as you close the internal valve like when you ambient pressure in your lungs when diving. This valve opens when your lungs get flat like a second stage.

So if you do a negative test the valve opens also ... this then introduces you shutoff valve ... hose ... manifold ... every hose on the dilluent side of the manifold and you dilluent first stage to the system. Are you sure it's the ADV giving the problems.

Try a negative test with the shutoff valve closed ... if it still leaks the you at least isolated all of the other things

Paul

It leaks in the open and closed position, when sucking throught he hoses i can hear the air coming in..... i've ordered a complete st of O rings, even though on a visual test they all seemed to be ok, the only ones i didn't check are the two on the inside of the barrel, where the ADV attaches to 'T'

wizbang · 22nd March 2006, 20:22

Quote: (Originally Posted by Nick uk.)

It leaks in the open and closed position, when sucking throught he hoses i can hear the air coming in..... i've ordered a complete st of O rings, even though on a visual test they all seemed to be ok, the only ones i didn't check are the two on the inside of the barrel, where the ADV attaches to 'T'

Nick, drown it. Do the same tests with it submerged in the bath/tub etc.
If you can hear it coming in then it must do it while submerged and you will be able to see it.

Only other thing that comes to mind is the actual diaphram of the ADV, maybe small hole that only opens when stretched.

Good luck.

Nick uk. · 22nd March 2006, 20:36

Quote: (Originally Posted by wizbang)

Nick, drown it. Do the same tests with it submerged in the bath/tub etc.
If you can hear it coming in then it must do it while submerged and you will be able to see it.

Only other thing that comes to mind is the actual diaphram of the ADV, maybe small hole that only opens when stretched.

Good luck.

I checked the diaphram, stripped it streched it, it's fine. I will reserve judgement untill i have changed all the O rings, after a visual inspection the only remainding culprates are the two O rings inside the barrel, which i can't see fully.

20th March 2006, 23:03	#1 (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: 575	Leaky ADV. I've got a leaky ADV..... When trying a neg test, air leaks in from the ADV as i suck out the air, in both the open and shut position, the weird thing is it doesn't leak when under preasure, i striped it cleaned and greased it, put it back together, and it still leaks. Another strange thing is that if i unscrew the nut that holds it to the 'T', it doesn't leak, when i bolt it down it leaks again????? Any ideas..... i 'thought' i was going diving tommorow. __________________ If it aint broke....don't fix it, and if it is.............well......get another one! divechief2000@hotmail.com
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22nd March 2006, 04:45	#2 (permalink)
RebreatherDave Maximum **** Current Rebreather/s: Inspiration Classic Other Rebreather/s:** Join Date: May 2005 Location: L.A., where the debris meets the sea Posts: 226	Re: Leaky ADV. I was on a dive when I had a dil leak at the swivel that attaches to the side of the AP ADV. It took awhile to reach back, but finally after much contortion I slid the barrel on the shutoff and then went to manual dil addition the rest of the dive. I took off the swivel and replaced the o-ring on the side with a Viton one lubed with Christo-Lube, but it still leaded. Ends up being the tiny o-ring in the end of the hose that screws into the swivel opening. Someone shouuld make a sliding barrel shutoff where the barrel does not interfere with the side of the corrugated hose collar as the one I now have does.
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22nd March 2006, 07:53	#3 (permalink)
pabusk Custom Title Allowed! Current Rebreather/s: Inspiration Vision Other Rebreather/s: Not Bought Yet Inspiration Classic Join Date: Dec 2005 Location: Holland Posts: 133	Re: Leaky ADV. Hi Nick, It sounds logical that the ADV doesn't leak under pressure as you close the internal valve like when you ambient pressure in your lungs when diving. This valve opens when your lungs get flat like a second stage. So if you do a negative test the valve opens also ... this then introduces you shutoff valve ... hose ... manifold ... every hose on the dilluent side of the manifold and you dilluent first stage to the system. Are you sure it's the ADV giving the problems. Try a negative test with the shutoff valve closed ... if it still leaks the you at least isolated all of the other things Paul
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22nd March 2006, 08:47	#4 (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: 575	Re: Leaky ADV. Quote: (Originally Posted by pabusk) Hi Nick, It sounds logical that the ADV doesn't leak under pressure as you close the internal valve like when you ambient pressure in your lungs when diving. This valve opens when your lungs get flat like a second stage. So if you do a negative test the valve opens also ... this then introduces you shutoff valve ... hose ... manifold ... every hose on the dilluent side of the manifold and you dilluent first stage to the system. Are you sure it's the ADV giving the problems. Try a negative test with the shutoff valve closed ... if it still leaks the you at least isolated all of the other things Paul It leaks in both open amd closed position. I've ordered a set of O rings to change tem all out, on visual inspection they all seemed to be ok, the only ones i didn't take out to check are the two on the inside of the barrel, will do that when the new set arrive. __________________ If it aint broke....don't fix it, and if it is.............well......get another one! divechief2000@hotmail.com
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22nd March 2006, 08:50	#5 (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: 575	Re: Leaky ADV. Quote: (Originally Posted by pabusk) Hi Nick, It sounds logical that the ADV doesn't leak under pressure as you close the internal valve like when you ambient pressure in your lungs when diving. This valve opens when your lungs get flat like a second stage. So if you do a negative test the valve opens also ... this then introduces you shutoff valve ... hose ... manifold ... every hose on the dilluent side of the manifold and you dilluent first stage to the system. Are you sure it's the ADV giving the problems. Try a negative test with the shutoff valve closed ... if it still leaks the you at least isolated all of the other things Paul It leaks in the open and closed position, when sucking throught he hoses i can hear the air coming in..... i've ordered a complete st of O rings, even though on a visual test they all seemed to be ok, the only ones i didn't check are the two on the inside of the barrel, where the ADV attaches to 'T' __________________ If it aint broke....don't fix it, and if it is.............well......get another one! divechief2000@hotmail.com
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22nd March 2006, 20:22	#6 (permalink)
wizbang WEB MERMEN Current Rebreather/s: Inspiration Classic Dolphin Home Build Other Rebreather/s: Not Bought Yet Inspiration Vision Evolution Prism Topaz Sport Kiss Classic Kiss Dolphin Home Build Join Date: Feb 2005 Location: Perth Australia Posts: 386	Re: Leaky ADV. Quote: (Originally Posted by Nick uk.) It leaks in the open and closed position, when sucking throught he hoses i can hear the air coming in..... i've ordered a complete st of O rings, even though on a visual test they all seemed to be ok, the only ones i didn't check are the two on the inside of the barrel, where the ADV attaches to 'T' Nick, drown it. Do the same tests with it submerged in the bath/tub etc. If you can hear it coming in then it must do it while submerged and you will be able to see it. Only other thing that comes to mind is the actual diaphram of the ADV, maybe small hole that only opens when stretched. Good luck.
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22nd March 2006, 20:36	#7 (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: 575	Re: Leaky ADV. Quote: (Originally Posted by wizbang) Nick, drown it. Do the same tests with it submerged in the bath/tub etc. If you can hear it coming in then it must do it while submerged and you will be able to see it. Only other thing that comes to mind is the actual diaphram of the ADV, maybe small hole that only opens when stretched. Good luck. I checked the diaphram, stripped it streched it, it's fine. I will reserve judgement untill i have changed all the O rings, after a visual inspection the only remainding culprates are the two O rings inside the barrel, which i can't see fully. __________________ If it aint broke....don't fix it, and if it is.............well......get another one! divechief2000@hotmail.com
(Offline)

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