home made dsv

DanFountain · 5th February 2008, 17:09

Quote: (Originally Posted by David Parker)

Has anyone tried to make a Kiss type version of the PVC ball valve ?? or does anyone have any thoughts???

Yup, just drill one more hole in the bottom of the valve & add appropriate fittings to mate to your second stage of choice. With the DSV closed, the loop is sealed off by the ball and the mouthpiece connects to the reg. Since there isn't a valve seat on the reg connection or the mouthpiece connection, there will be some leakage between them when the loop is open - probably not enough to cause any significant leakage, but far from ideal. Maybe with a proper 3-way, full-union ball valve you could get a good seal, but not with the garden-variety hardware store valves so dear to the homebuilder. Besides, it's uglier than sin and there's enough hardware hanging out there that it could break one's neck if he turned his head while scootering... (Or maybe that's just mine... Picture to follow once I get on a fast connection again - did I mention that dial-up sucks?)

-Dan

DanFountain · 6th February 2008, 01:38

I told you it was ugly...

I don't think this one will ever get wet.

Check valves are from 3M dust respirators - polypropylene cages stuffed into the bore of the valve. The mushroom diameter closely matches the ID of the tubing, causing an awful moaning sound on exhale.

-Dan

kiwi_diver · 6th February 2008, 05:36

Dan, mate, that's right up there with my soviet job...

You could at least have used one of the newer lightweight plastic second stages!!

DanFountain · 6th February 2008, 20:54

Quote: (Originally Posted by kiwi_diver)

...
You could at least have used one of the newer lightweight plastic second stages!!

Now way! That's a ScubaPro Balanced Adjustable - the 1964 Cadillac of regulators!

-DAN (Junkyard Wars wannabe)

David Parker · 24th February 2008, 22:19

Here is my first atempt I think the mushroom valves I got from a dust mask work ok but I seem to get resistance when I breathe fast through it any ideas ???????

Plus there must be a website that just sells mushroom valves any more ideas ??

Cheers
Dave

rchrds · 26th February 2008, 19:19

This is what I'm talking about. That thing in the post above is ugly as hell- but it's sure fun stuff to make. Sometimes even more fun than diving it!

Keep it up!

Jason

**jmurba** · 8th March 2008, 21:28

Quote: (Originally Posted by firemandiver)

A DSV is nothing to be making out of PVC fittings and plumber's putty.

Why nothing in pvc ?
I have a lathe and am machining a lot of pressure pvc fitting with success
pvc is esay to machine, it is easy to glue , only the grey color is a small problem for me.

regards

jean mi

seakrakken · 9th March 2008, 04:02

Quote: (Originally Posted by firemandiver)

A DSV is nothing to be making out of PVC fittings and plumber's putty.
Why nothing in pvc ?
I have a lathe and am machining a lot of pressure pvc fitting with success
pvc is esay to machine, it is easy to glue , only the grey color is a small problem for me.

regards

jean mi
__________________

You go! Jean Mi!
firemandiver is of the mindset that all life support equip is highly technical and must be made by highly qualified individuals on a Govt. contract.
Truth be known life support equipment is made by the avg factory worker.
In the factory R&D section of the firm what you are doing is called "Prototyping" Once you have your prototype done and it works to your satisfaction and you have "Field Tested" it, it would then go to "Production Tooling" where it would be polished up and injection molded by the thousands.

AD_ward9 · 9th March 2008, 06:25

Quote: (Originally Posted by seakrakken)

__________________

You go! Jean Mi!
firemandiver is of the mindset that all life support equip is highly technical and must be made by highly qualified individuals on a Govt. contract.
Truth be known life support equipment is made by the avg factory worker.
In the factory R&D section of the firm what you are doing is called "Prototyping" Once you have your prototype done and it works to your satisfaction and you have "Field Tested" it, it would then go to "Production Tooling" where it would be polished up and injection molded by the thousands.

Seakrakken is unfortunately too accurate for sports RBs as they stand just now, but Firemandiver in Post 3 is right.

Take PVC to start with. Put it into a chamber with a window in it. Blow down, bring it back to surface. Watch it smoke on the way back up, especially with helium: literally the gases that come off it often look like smoke (I must post some pics!). Now try to google something like "PVC Greenpeace" and then "MSDS PVC", and look what you are breathing in. Nothing to worry about right now, but it will not help you attain much in the way of old age. Now take valves that stick, handles fall off, hoses fall off, WOB is through the roof, mushroom valves that stick, or get trapped in the mushroom's spider, mushrooms that soften in water or oil then fold up, etc.

Learn from the experience Paul Raymakers is kindly reporting free of charge on this forum: he has more resources than most home builders, designed his rEvo, improved it, thought he got it "right", then went and tested it. Look at how many mods he is doing from the test results just to get to the "minimum" safety level of EN14143. Until you test it scientifically, thoroughly, you do not have the faintest idea what you have done. Look at the recall of the EDO4: after that mouthpiece killed one or two people.

It is your life, but I have stopped diving things that come from tiny design shops, no matter how big their factor is, at least on my main breathing loop. I put that down to experience.

Home build is one thing, but best to start by building and proving your test equipment, then design your accessory or Rebreather, IMHO.

Alex

**jmurba** · 9th March 2008, 14:05

Quote: (Originally Posted by AD_ward9)

Seakrakken is unfortunately too accurate for sports RBs as they stand just now, but Firemandiver in Post 3 is right.

Take PVC to start with. Put it into a chamber with a window in it. Blow down, bring it back to surface. Watch it smoke on the way back up, especially with helium: literally the gases that come off it often look like smoke (I must post some pics!). Now try to google something like "PVC Greenpeace" and then "MSDS PVC", and look what you are breathing in. Nothing to worry about right now, but it will not help you attain much in the way of old age. Now take valves that stick, handles fall off, hoses fall off, WOB is through the roof, mushroom valves that stick, or get trapped in the mushroom's spider, mushrooms that soften in water or oil then fold up, etc.

Learn from the experience Paul Raymakers is kindly reporting free of charge on this forum: he has more resources than most home builders, designed his rEvo, improved it, thought he got it "right", then went and tested it. Look at how many mods he is doing from the test results just to get to the "minimum" safety level of EN14143. Until you test it scientifically, thoroughly, you do not have the faintest idea what you have done. Look at the recall of the EDO4: after that mouthpiece killed one or two people.

It is your life, but I have stopped diving things that come from tiny design shops, no matter how big their factor is, at least on my main breathing loop. I put that down to experience.

Home build is one thing, but best to start by building and proving your test equipment, then design your accessory or Rebreather, IMHO.

Alex

I've dived almost 5 years at least once a week with a part of my loop made of pvc, no problem.....i must be a robot will ask isaac asimov

tecme parts are from pvc, cis lunar cannistes are made from pvc, paul's canisters look like pvc voyager Rebreather explorer look like they are made of pvc.....

we are all survivors.....

regards

jean mi

5th February 2008, 17:09	#31 (permalink)
DanFountain This is my custom title! Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: Dec 2005 Location: Lake Superior Posts: 103	Re: home made dsv Quote: (Originally Posted by David Parker) Has anyone tried to make a Kiss type version of the PVC ball valve ?? or does anyone have any thoughts??? Yup, just drill one more hole in the bottom of the valve & add appropriate fittings to mate to your second stage of choice. With the DSV closed, the loop is sealed off by the ball and the mouthpiece connects to the reg. Since there isn't a valve seat on the reg connection or the mouthpiece connection, there will be some leakage between them when the loop is open - probably not enough to cause any significant leakage, but far from ideal. Maybe with a proper 3-way, full-union ball valve you could get a good seal, but not with the garden-variety hardware store valves so dear to the homebuilder. Besides, it's uglier than sin and there's enough hardware hanging out there that it could break one's neck if he turned his head while scootering... (Or maybe that's just mine... Picture to follow once I get on a fast connection again - did I mention that dial-up sucks?) -Dan __________________ Try not. Do - or do not. There is no try. -Yoda
(Online)

6th February 2008, 01:38	#32 (permalink)
DanFountain This is my custom title! Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: Dec 2005 Location: Lake Superior Posts: 103	Re: home made dsv I told you it was ugly... I don't think this one will ever get wet. Check valves are from 3M dust respirators - polypropylene cages stuffed into the bore of the valve. The mushroom diameter closely matches the ID of the tubing, causing an awful moaning sound on exhale. -Dan __________________ Try not. Do - or do not. There is no try. -Yoda
(Online)

6th February 2008, 05:36	#33 (permalink)
kiwi_diver Alias - Ray Mansell Current Rebreather/s: Other SCR Other Rebreather/s: Other SCR Join Date: Aug 2007 Location: Auckland, New Zealand Posts: 157	Re: home made dsv Dan, mate, that's right up there with my soviet job... You could at least have used one of the newer lightweight plastic second stages!! __________________ Ray. == Latitude 36 South, where the deeper you dive, the warmer it gets! ==
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6th February 2008, 20:54	#34 (permalink)
DanFountain This is my custom title! Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: Dec 2005 Location: Lake Superior Posts: 103	Re: home made dsv Quote: (Originally Posted by kiwi_diver) ... You could at least have used one of the newer lightweight plastic second stages!! Now way! That's a ScubaPro Balanced Adjustable - the 1964 Cadillac of regulators! -DAN (Junkyard Wars wannabe) __________________ Try not. Do - or do not. There is no try. -Yoda
(Online)

26th February 2008, 19:19	#36 (permalink)
rchrds New Member Current Rebreather/s: Other CCR RB80 / Clone Home Build Other Rebreather/s: Other CCR RB80 / Clone Home Build Join Date: Feb 2005 Location: Clarksville, TN Posts: 41	Re: home made dsv This is what I'm talking about. That thing in the post above is ugly as hell- but it's sure fun stuff to make. Sometimes even more fun than diving it! Keep it up! Jason
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8th March 2008, 21:28	#37 (permalink)
jmurba wet bear Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: May 2006 Location: cannes france Posts: 862	Re: home made dsv Quote: (Originally Posted by firemandiver) A DSV is nothing to be making out of PVC fittings and plumber's putty. Why nothing in pvc ? I have a lathe and am machining a lot of pressure pvc fitting with success pvc is esay to machine, it is easy to glue , only the grey color is a small problem for me. regards jean mi __________________ when will I be able to think about something else then spending hours underwater, when will I be normal ? http://web.mac.com/jmurba/Site_2/home.html http://web.mac.com/jmurba/Site_3/home.html
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9th March 2008, 04:02	#38 (permalink)
seakrakken Bob in Dallas Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: Apr 2005 Location: USA Posts: 12	Re: home made dsv Quote: (Originally Posted by firemandiver) A DSV is nothing to be making out of PVC fittings and plumber's putty. Why nothing in pvc ? I have a lathe and am machining a lot of pressure pvc fitting with success pvc is esay to machine, it is easy to glue , only the grey color is a small problem for me. regards jean mi __________________ You go! Jean Mi! firemandiver is of the mindset that all life support equip is highly technical and must be made by highly qualified individuals on a Govt. contract. Truth be known life support equipment is made by the avg factory worker. In the factory R&D section of the firm what you are doing is called "Prototyping" Once you have your prototype done and it works to your satisfaction and you have "Field Tested" it, it would then go to "Production Tooling" where it would be polished up and injection molded by the thousands.
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9th March 2008, 06:25	#39 (permalink)
AD_ward9 So much more to learn Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Jun 2005 Location: Scotland Posts: 1,868	Re: home made dsv Quote: (Originally Posted by seakrakken) __________________ You go! Jean Mi! firemandiver is of the mindset that all life support equip is highly technical and must be made by highly qualified individuals on a Govt. contract. Truth be known life support equipment is made by the avg factory worker. In the factory R&D section of the firm what you are doing is called "Prototyping" Once you have your prototype done and it works to your satisfaction and you have "Field Tested" it, it would then go to "Production Tooling" where it would be polished up and injection molded by the thousands. Seakrakken is unfortunately too accurate for sports RBs as they stand just now, but Firemandiver in Post 3 is right. Take PVC to start with. Put it into a chamber with a window in it. Blow down, bring it back to surface. Watch it smoke on the way back up, especially with helium: literally the gases that come off it often look like smoke (I must post some pics!). Now try to google something like "PVC Greenpeace" and then "MSDS PVC", and look what you are breathing in. Nothing to worry about right now, but it will not help you attain much in the way of old age. Now take valves that stick, handles fall off, hoses fall off, WOB is through the roof, mushroom valves that stick, or get trapped in the mushroom's spider, mushrooms that soften in water or oil then fold up, etc. Learn from the experience Paul Raymakers is kindly reporting free of charge on this forum: he has more resources than most home builders, designed his rEvo, improved it, thought he got it "right", then went and tested it. Look at how many mods he is doing from the test results just to get to the "minimum" safety level of EN14143. Until you test it scientifically, thoroughly, you do not have the faintest idea what you have done. Look at the recall of the EDO4: after that mouthpiece killed one or two people. It is your life, but I have stopped diving things that come from tiny design shops, no matter how big their factor is, at least on my main breathing loop. I put that down to experience. Home build is one thing, but best to start by building and proving your test equipment, then design your accessory or Rebreather, IMHO. Alex Last edited by AD_ward9 : 9th March 2008 at 06:41.
(Offline)

9th March 2008, 14:05	#40 (permalink)
jmurba wet bear Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: May 2006 Location: cannes france Posts: 862	Re: home made dsv Quote: (Originally Posted by AD_ward9) Seakrakken is unfortunately too accurate for sports RBs as they stand just now, but Firemandiver in Post 3 is right. Take PVC to start with. Put it into a chamber with a window in it. Blow down, bring it back to surface. Watch it smoke on the way back up, especially with helium: literally the gases that come off it often look like smoke (I must post some pics!). Now try to google something like "PVC Greenpeace" and then "MSDS PVC", and look what you are breathing in. Nothing to worry about right now, but it will not help you attain much in the way of old age. Now take valves that stick, handles fall off, hoses fall off, WOB is through the roof, mushroom valves that stick, or get trapped in the mushroom's spider, mushrooms that soften in water or oil then fold up, etc. Learn from the experience Paul Raymakers is kindly reporting free of charge on this forum: he has more resources than most home builders, designed his rEvo, improved it, thought he got it "right", then went and tested it. Look at how many mods he is doing from the test results just to get to the "minimum" safety level of EN14143. Until you test it scientifically, thoroughly, you do not have the faintest idea what you have done. Look at the recall of the EDO4: after that mouthpiece killed one or two people. It is your life, but I have stopped diving things that come from tiny design shops, no matter how big their factor is, at least on my main breathing loop. I put that down to experience. Home build is one thing, but best to start by building and proving your test equipment, then design your accessory or Rebreather, IMHO. Alex I've dived almost 5 years at least once a week with a part of my loop made of pvc, no problem.....i must be a robot will ask isaac asimov tecme parts are from pvc, cis lunar cannistes are made from pvc, paul's canisters look like pvc voyager Rebreather explorer look like they are made of pvc..... we are all survivors..... regards jean mi __________________ when will I be able to think about something else then spending hours underwater, when will I be normal ? http://web.mac.com/jmurba/Site_2/home.html http://web.mac.com/jmurba/Site_3/home.html
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