Gas cut-off valve for O2

krause · 30th November 2006, 18:55

Hi there...

I started on my meg-corse the other day... GREAT!!

but I dont understand why there is a gas cut-off valve for the dill. and not for the O2..? I think the boris and cis lunar have one..

why not on the meg..? it will be very easy to controle PO2 manual by bypassing the solenoid i case of a error on the solernoid...
A cut-off valve next to the 1. stage on the oxygen feed to the solenoid will be nice...!!!

or is it something I dont understand..?

Michael....

JonnyB · 30th November 2006, 20:25

Hi,
Well the O2 side first stage has a op leak valve, so if there is a leak it will not go in the loop.
There is also the QC on the solenoid

/Jonny

Joe · 30th November 2006, 20:30

I thought about that but after diving the unit for over a year now I feel it is not necessary.

The new Jaska solenoid has an orifice in it so even with a stuck solenoid you have adequate time to deal with it plus the nature of the QD is such that if you reach back and push the outer ring on the female side of the QD the male end will pop out. So, with a stuck open solenoid I would first close the valve on the O2 tank and dil flush to bring PO2 to acceptable levels and then I would simply disconnect the hose that goes to the solenoid and dive manual.

That said, if you go to MJ Engineering's web site they have the necessary fittings to modify your hose to accept a shut off at the 1st stage, though I think you will find that as you become more comfortable on the unit you will probably decide it is not necessary.

Good luck with your training!

Quote: (Originally Posted by krause)

Hi there...

I started on my meg-corse the other day... GREAT!!

but I dont understand why there is a gas cut-off valve for the dill. and not for the O2..? I think the boris and cis lunar have one..

why not on the meg..? it will be very easy to controle PO2 manual by bypassing the solenoid i case of a error on the solernoid...
A cut-off valve next to the 1. stage on the oxygen feed to the solenoid will be nice...!!!

or is it something I dont understand..?

Michael....

webhead · 30th November 2006, 21:25

Quote: (Originally Posted by krause)

but I dont understand why there is a gas cut-off valve for the dill. and not for the O2..?

Are you talking about an isolation valve between the Dil 1st stage and the ADV? I've added one here and use it to "shut off" the ADV for the dive and ascent - helps in keeping minimum loop volume. I use the ADV only for descent.

Have not had a need to isolate the solenoid. I would be worried that if it did get closed, you'd have a dropping PO2, which you should detect before it becomes a problem but the one time you don't......

Steve · 1st December 2006, 01:30

With the aim of always turning the flow of O2 on slowly in mind; it is much easier to feather a valve that to carefully operate a flow stop with precision.

**wedivebc** · 1st December 2006, 04:44

Quote: (Originally Posted by Steve)

With the aim of always turning the flow of O2 on slowly in mind; it is much easier to feather a valve that to carefully operate a flow stop with precision.

I agree. I dove with a sticky kiss valve using just that technique and it worked fine. My PO2 may have fluctuated more than usual but I was able to keep it between 1.2 and 0.9 just by feathering the O2 valve.

Benthic · 1st December 2006, 14:10

Gregg @ Wakulla Diving sells a kit that includes an isolator and y-block from MJ Engineering. This is installed so that a single oxygen line comes from the 1st stage to the Y. Then, leaving the Y you have a line to the manual add valve and a line to the solenoid. The line to the solenoid has the isolator in it. In this way, if the solenoid fails in the open position you can close the isolator to stop flow to the solenoid and still retain use of the manual add valve.

Don't know if this is what you're looking for, but it's another option that's out there.

Brian

krause · 1st December 2006, 15:26

Quote: (Originally Posted by Benthic)

Gregg @ Wakulla Diving sells a kit that includes an isolator and y-block from MJ Engineering. This is installed so that a single oxygen line comes from the 1st stage to the Y. Then, leaving the Y you have a line to the manual add valve and a line to the solenoid. The line to the solenoid has the isolator in it. In this way, if the solenoid fails in the open position you can close the isolator to stop flow to the solenoid and still retain use of the manual add valve.

Don't know if this is what you're looking for, but it's another option that's out there.

Brian

Just what I need, thanks Brian

PPA · 2nd December 2006, 12:47

Hi
I bought that from greg and works great. I'm very happy.
Cheers
Pedro

Allan_o · 2nd December 2006, 13:37

Quote: (Originally Posted by JonnyB)

Hi,
Well the O2 side first stage has a op leak valve, so if there is a leak it will not go in the loop.
There is also the QC on the solenoid

/Jonny

Hi Johnny.
What does the op leak valve on the first stage have to do with o2 in the loop?

i guess you mean leak from the first stage, but isent the solenoid an "in danish/swedish" (modstrøms ventil?) in that case the o2 would not go into the loop, more likely the hose would explode????

Regards Allan

30th November 2006, 18:55	#1 (permalink)
krause New Member Current Rebreather/s: Megalodon Other CCR Other Rebreather/s: Other CCR Join Date: Nov 2006 Location: Denmark Posts: 26	Gas cut-off valve for O2 Hi there... I started on my meg-corse the other day... GREAT!! but I dont understand why there is a gas cut-off valve for the dill. and not for the O2..? I think the boris and cis lunar have one.. why not on the meg..? it will be very easy to controle PO2 manual by bypassing the solenoid i case of a error on the solernoid... A cut-off valve next to the 1. stage on the oxygen feed to the solenoid will be nice...!!! or is it something I dont understand..? Michael....
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30th November 2006, 20:25	#2 (permalink)
JonnyB Johnny The Hatch Current Rebreather/s: MK 15.X Titan Other CCR Other SCR Home Build Other Rebreather/s: Not Bought Yet Inspiration Classic Megalodon Sport Kiss Classic Kiss Other CCR Other SCR Home Build Join Date: Jan 2005 Location: Sweden (Stockholm)/Cyprus(Ayia Napa) Posts: 991	Re: Gas cut-off valve for O2 Hi, Well the O2 side first stage has a op leak valve, so if there is a leak it will not go in the loop. There is also the QC on the solenoid /Jonny __________________ A quote from Crazyduck - In remembering our own Rob Davies. "Outbound flight 777 heavy you are cleared for flight Due west into that warm red Texas sunset You have angels on your wings and divers memories on your six." Rest In Peace http://www.divetekcyprus.com http://www.diveccr.com
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30th November 2006, 20:30	#3 (permalink)
Joe RBW Member Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Oct 2005 Location: Florida, USA Posts: 321	Re: Gas cut-off valve for O2 I thought about that but after diving the unit for over a year now I feel it is not necessary. The new Jaska solenoid has an orifice in it so even with a stuck solenoid you have adequate time to deal with it plus the nature of the QD is such that if you reach back and push the outer ring on the female side of the QD the male end will pop out. So, with a stuck open solenoid I would first close the valve on the O2 tank and dil flush to bring PO2 to acceptable levels and then I would simply disconnect the hose that goes to the solenoid and dive manual. That said, if you go to MJ Engineering's web site they have the necessary fittings to modify your hose to accept a shut off at the 1st stage, though I think you will find that as you become more comfortable on the unit you will probably decide it is not necessary. Good luck with your training! Quote: (Originally Posted by krause) Hi there... I started on my meg-corse the other day... GREAT!! but I dont understand why there is a gas cut-off valve for the dill. and not for the O2..? I think the boris and cis lunar have one.. why not on the meg..? it will be very easy to controle PO2 manual by bypassing the solenoid i case of a error on the solernoid... A cut-off valve next to the 1. stage on the oxygen feed to the solenoid will be nice...!!! or is it something I dont understand..? Michael....
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30th November 2006, 21:25	#4 (permalink)
webhead Earning the green stuff.. Current Rebreather/s: Megalodon Other Rebreather/s: Inspiration Classic Inspiration Vision Evolution Megalodon Join Date: Mar 2006 Location: East central Florida Posts: 284	Re: Gas cut-off valve for O2 Quote: (Originally Posted by krause) but I dont understand why there is a gas cut-off valve for the dill. and not for the O2..? Are you talking about an isolation valve between the Dil 1st stage and the ADV? I've added one here and use it to "shut off" the ADV for the dive and ascent - helps in keeping minimum loop volume. I use the ADV only for descent. Have not had a need to isolate the solenoid. I would be worried that if it did get closed, you'd have a dropping PO2, which you should detect before it becomes a problem but the one time you don't...... __________________ "These are not the droids you are looking for.... move along" - Obi-Wan Kenobi
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1st December 2006, 01:30	#5 (permalink)
Steve Ladies bring a plate Current Rebreather/s: Megalodon Home Build Other Rebreather/s: Not Bought Yet Inspiration Classic Sport Kiss Classic Kiss MK 15.X Home Build Join Date: Feb 2005 Location: Perth - Australia Posts: 1,126	Re: Gas cut-off valve for O2 With the aim of always turning the flow of O2 on slowly in mind; it is much easier to feather a valve that to carefully operate a flow stop with precision. __________________ WARNING: I contain occasional coarse language, extreme sexual references, nudity, and adult themes, which may offend some people - Usually churchy types.
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1st December 2006, 04:44	#6 (permalink)
wedivebc Dave Tomblin Current Rebreather/s: Megalodon Other CCR Other Rebreather/s: Not Bought Yet Inspiration Classic Sport Kiss Other CCR Join Date: Feb 2005 Location: Vancouver Island BC Canada Posts: 1,508	Re: Gas cut-off valve for O2 Quote: (Originally Posted by Steve) With the aim of always turning the flow of O2 on slowly in mind; it is much easier to feather a valve that to carefully operate a flow stop with precision. I agree. I dove with a sticky kiss valve using just that technique and it worked fine. My PO2 may have fluctuated more than usual but I was able to keep it between 1.2 and 0.9 just by feathering the O2 valve. __________________ Cheers, Dave.... Man is the only animal burdened with the knowledge he will eventually die
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1st December 2006, 14:10	#7 (permalink)
Benthic MEGalomaniac Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Jan 2006 Location: Pensacola, FL USA Posts: 226	Re: Gas cut-off valve for O2 Gregg @ Wakulla Diving sells a kit that includes an isolator and y-block from MJ Engineering. This is installed so that a single oxygen line comes from the 1st stage to the Y. Then, leaving the Y you have a line to the manual add valve and a line to the solenoid. The line to the solenoid has the isolator in it. In this way, if the solenoid fails in the open position you can close the isolator to stop flow to the solenoid and still retain use of the manual add valve. Don't know if this is what you're looking for, but it's another option that's out there. Brian __________________ Well lit rooms will not repel determined beer ninjas.
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1st December 2006, 15:26	#8 (permalink)
krause New Member Current Rebreather/s: Megalodon Other CCR Other Rebreather/s: Other CCR Join Date: Nov 2006 Location: Denmark Posts: 26	Re: Gas cut-off valve for O2 Quote: (Originally Posted by Benthic) Gregg @ Wakulla Diving sells a kit that includes an isolator and y-block from MJ Engineering. This is installed so that a single oxygen line comes from the 1st stage to the Y. Then, leaving the Y you have a line to the manual add valve and a line to the solenoid. The line to the solenoid has the isolator in it. In this way, if the solenoid fails in the open position you can close the isolator to stop flow to the solenoid and still retain use of the manual add valve. Don't know if this is what you're looking for, but it's another option that's out there. Brian Just what I need, thanks Brian
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2nd December 2006, 12:47	#9 (permalink)
PPA New Member Current Rebreather/s: Megalodon Sport Kiss Other Rebreather/s: Join Date: Apr 2005 Location: portugal Posts: 56	Re: Gas cut-off valve for O2 Hi I bought that from greg and works great. I'm very happy. Cheers Pedro
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2nd December 2006, 13:37	#10 (permalink)
Allan_o New Member Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Dec 2005 Location: Copenhagen Denmark Posts: 81	Re: Gas cut-off valve for O2 Quote: (Originally Posted by JonnyB) Hi, Well the O2 side first stage has a op leak valve, so if there is a leak it will not go in the loop. There is also the QC on the solenoid /Jonny Hi Johnny. What does the op leak valve on the first stage have to do with o2 in the loop? i guess you mean leak from the first stage, but isent the solenoid an "in danish/swedish" (modstrøms ventil?) in that case the o2 would not go into the loop, more likely the hose would explode???? Regards Allan
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