Draeger DSV issues

venturi · 27th August 2007, 10:27

I had same kind of problem (posted something about it recently http://www.rebreatherworld.com/semi-...lphin-dsv.html) solved by a new barrel (small scratch on the blue o-ring) and by polishing the dsv body with a polishing paste : even cleaned, some wearing spots were there. polish the barrel made them disappear.

pirateeye · 27th August 2007, 13:21

Tried oring barrel in both directions and i was slightly better in one direction than the other but still leaked. I will be polishing the outer housing while awaiting the new oring barrels arrival. Also found an interesting lubicant. Dow Corning # 55 Oring Lube ( yes I know it is not O2 rated ). This works with the Oring leakage issue on the hose ends. It slightly swells the oring and creates a much tighter seal while still allowing you to adjust the angle of the mouthpiece with the unit assembled. The adjustment is however tight enough that it requires 2 hands but you dont have to loosen the nuts.

CCRDVR · 27th August 2007, 14:56

Quote: (Originally Posted by pirateeye)

Tried oring barrel in both directions and i was slightly better in one direction than the other but still leaked. I will be polishing the outer housing while awaiting the new oring barrels arrival. Also found an interesting lubicant. Dow Corning # 55 Oring Lube ( yes I know it is not O2 rated ). This works with the Oring leakage issue on the hose ends. It slightly swells the oring and creates a much tighter seal while still allowing you to adjust the angle of the mouthpiece with the unit assembled. The adjustment is however tight enough that it requires 2 hands but you dont have to loosen the nuts.

Did it still leak when you had it fully open? Originally mine did leak when open (actually got a partial flood), but after reversing the barrel in the DSV, it no longer leaked in the open position and stayed nice a dry. I did find that with the mouthpiece closed I could blow air through the mouthpiece and around the barrel. This didn't seem to cause any problems. Good luck with it.

**Freef** · 27th August 2007, 16:22

Quote: (Originally Posted by CCRDVR)

I did find that with the mouthpiece closed I could blow air through the mouthpiece and around the barrel.

If you were blowing in the mouthpiece then this would happen as in the closed position there is a designed 'leak' to let the water out of the mouth piece as you exhale while opening the valve.

Numpty diver · 27th August 2007, 19:16

Did you put the small o-ring back on knob that screws into the barrel ?

pirateeye · 27th August 2007, 22:05

Yes. Mine has a red washer disc not an o ring. Even tried a new one prior to determining it must be the barrel oring assembly.

Dragerneil · 28th August 2007, 15:13

The other place these can leak is if the washer at the base of the lever is defective. This was the problem the only time I had a leak.

You say that you have taken it to pieces and greased it, but that it is still stiff. Mine can all be operated easily. One trick when taking apart is to put it in a freezer. The metal inner shrinks more than the plastic outer so it more or less falls out. Can use this trick when rebuilding so as not to displace any of the O-ring material.

Hope you get sorted.

Neil

pirateeye · 28th August 2007, 16:19

I will try the freezer trick with the new barrel when it arrives. I will also polish the inside of the outer housing prior to asembly. In the meantime I made a new lever which is larger ( see pic ) to try and assist with he difficulty in operation. I just used a piece of delrinand a stainless bolt.

venturi · 30th August 2007, 08:52

good job,
where did you get the delrin part from ?

pirateeye · 31st August 2007, 01:22

I made it on a mini lathe from an old key chain ( it was a kubaton " self defense key chain " that was a free sample

from someplace ). I then swaped out the m6 bolt for a 1/4 20 as I could not readily find a stainless m6 the right length. I ran the threads and bolt about 3/4 of the way up the piece to try and make it as strong as possible.

27th August 2007, 10:27	#11 (permalink)
venturi New Member Current Rebreather/s: Dolphin Other Rebreather/s: Dolphin Join Date: Sep 2006 Location: france Posts: 27	Re: Draeger DSV issues I had same kind of problem (posted something about it recently http://www.rebreatherworld.com/semi-...lphin-dsv.html) solved by a new barrel (small scratch on the blue o-ring) and by polishing the dsv body with a polishing paste : even cleaned, some wearing spots were there. polish the barrel made them disappear. Last edited by venturi : 27th August 2007 at 10:33.
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27th August 2007, 13:21	#12 (permalink)
pirateeye New Member Current Rebreather/s: Dolphin Other Rebreather/s: Not Bought Yet Dolphin Join Date: Aug 2006 Location: New Hampshire Posts: 49	Re: Draeger DSV issues Tried oring barrel in both directions and i was slightly better in one direction than the other but still leaked. I will be polishing the outer housing while awaiting the new oring barrels arrival. Also found an interesting lubicant. Dow Corning # 55 Oring Lube ( yes I know it is not O2 rated ). This works with the Oring leakage issue on the hose ends. It slightly swells the oring and creates a much tighter seal while still allowing you to adjust the angle of the mouthpiece with the unit assembled. The adjustment is however tight enough that it requires 2 hands but you dont have to loosen the nuts. __________________ Why Buy It When You Can Spend More to Build It
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27th August 2007, 14:56	#13 (permalink)
CCRDVR New Member Current Rebreather/s: Optima Dolphin Other Rebreather/s: Dolphin Join Date: Feb 2006 Location: Annapolis, Maryland Posts: 77	Re: Draeger DSV issues Quote: (Originally Posted by pirateeye) Tried oring barrel in both directions and i was slightly better in one direction than the other but still leaked. I will be polishing the outer housing while awaiting the new oring barrels arrival. Also found an interesting lubicant. Dow Corning # 55 Oring Lube ( yes I know it is not O2 rated ). This works with the Oring leakage issue on the hose ends. It slightly swells the oring and creates a much tighter seal while still allowing you to adjust the angle of the mouthpiece with the unit assembled. The adjustment is however tight enough that it requires 2 hands but you dont have to loosen the nuts. Did it still leak when you had it fully open? Originally mine did leak when open (actually got a partial flood), but after reversing the barrel in the DSV, it no longer leaked in the open position and stayed nice a dry. I did find that with the mouthpiece closed I could blow air through the mouthpiece and around the barrel. This didn't seem to cause any problems. Good luck with it.
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27th August 2007, 16:22	#14 (permalink)
Freef Custom Title Disallowed! Current Rebreather/s: Dolphin Other Rebreather/s: Dolphin Join Date: Jan 2006 Location: Land of the Freef, UK. Posts: 1,353	Re: Draeger DSV issues Quote: (Originally Posted by CCRDVR) I did find that with the mouthpiece closed I could blow air through the mouthpiece and around the barrel. If you were blowing in the mouthpiece then this would happen as in the closed position there is a designed 'leak' to let the water out of the mouth piece as you exhale while opening the valve. __________________ David. Currently owner of two differently sized ankles.
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27th August 2007, 19:16	#15 (permalink)
Numpty diver Custom Title Allowed! Current Rebreather/s: Megalodon Other CCR Dolphin Ray Home Build Other Rebreather/s: Other CCR Dolphin Ray Home Build Join Date: Jul 2006 Location: Norway, Bergen Posts: 210	Re: Draeger DSV issues Did you put the small o-ring back on knob that screws into the barrel ?
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27th August 2007, 22:05	#16 (permalink)
pirateeye New Member Current Rebreather/s: Dolphin Other Rebreather/s: Not Bought Yet Dolphin Join Date: Aug 2006 Location: New Hampshire Posts: 49	Re: Draeger DSV issues Yes. Mine has a red washer disc not an o ring. Even tried a new one prior to determining it must be the barrel oring assembly. __________________ Why Buy It When You Can Spend More to Build It
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28th August 2007, 15:13	#17 (permalink)
Dragerneil New Member Current Rebreather/s: Evolution Dolphin Other Rebreather/s: Not Bought Yet Dolphin Join Date: Apr 2007 Location: N.Ireland Posts: 11	Re: Draeger DSV issues The other place these can leak is if the washer at the base of the lever is defective. This was the problem the only time I had a leak. You say that you have taken it to pieces and greased it, but that it is still stiff. Mine can all be operated easily. One trick when taking apart is to put it in a freezer. The metal inner shrinks more than the plastic outer so it more or less falls out. Can use this trick when rebuilding so as not to displace any of the O-ring material. Hope you get sorted. Neil
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30th August 2007, 08:52	#19 (permalink)
venturi New Member Current Rebreather/s: Dolphin Other Rebreather/s: Dolphin Join Date: Sep 2006 Location: france Posts: 27	Re: Draeger DSV issues good job, where did you get the delrin part from ?
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31st August 2007, 01:22	#20 (permalink)
pirateeye New Member Current Rebreather/s: Dolphin Other Rebreather/s: Not Bought Yet Dolphin Join Date: Aug 2006 Location: New Hampshire Posts: 49	Re: Draeger DSV issues I made it on a mini lathe from an old key chain ( it was a kubaton " self defense key chain " that was a free sample from someplace ). I then swaped out the m6 bolt for a 1/4 20 as I could not readily find a stainless m6 the right length. I ran the threads and bolt about 3/4 of the way up the piece to try and make it as strong as possible. __________________ Why Buy It When You Can Spend More to Build It
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