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Scuba Forum / General / March 2008one-way air valve
Hi scuba experts, I don't do scuba, but scuba looks like the closest thing to a small hobby project I am doing. It's a breathing circuit in which a person breathes through a ~3/4" diameter, ~1 foot long tube. The problem I am having is some of the exhaled air goes back into the tube and potentially reduces the percentage of oxygen of the subsequently inhaled air. So I am looking for a lightweight, simple one-way valve that would open and let the air on the inhale and close on the exhale. Fitting a standard 22 mm fitting would be helpful. How are such valves called, and who may sell them? On Sun, 09 Mar 2008 23:47:07 -0700, runcyclexcski wrote: > I don't do scuba, but scuba looks like the closest thing to a small > hobby project I am doing. It's a breathing circuit in which a person > breathes through a ~3/4" diameter, ~1 foot long tube. We call that a snorkel... > The problem I am having is some of the exhaled air goes back into the > tube and potentially reduces the percentage of oxygen of the > subsequently inhaled air. So I am looking for a lightweight, simple > one-way valve that would open and let the air on the inhale and close on > the exhale. Breathe through the mouth and exhale through the nose, perhaps? Otherwise, look at the construction of the purge valve on a snorkel... You would need two of them, one for the intake and one for the exhaust if you really did not want the intake air mixing with the exhaust air...  SignatureSee NNTP header field "X-Real-Email-Address" to reply by email. > Breathe through the mouth and exhale through the nose, perhaps? Good point, but my gizmo connects through the nose, and the user inhales through the nose and exhales through the mouth. When exhaling through the mouth some air inevitably gets exhaled through the nose. I know it because I get condensation on the exhale. >>Breathe through the mouth and exhale through the nose, perhaps? > > Good point, but my gizmo connects through the nose, and the user > inhales through the nose and exhales through the mouth. When exhaling > through the mouth some air inevitably gets exhaled through the nose. I > know it because I get condensation on the exhale. That's the way the Ohgushi Peerless scuba system works. esg > >>Breathe through the mouth and exhale through the nose, perhaps? > > [quoted text clipped - 4 lines] > > > That's the way the Ohgushi Peerless scuba system works. Bastard. > Hi scuba experts, > [quoted text clipped - 7 lines] > Fitting a standard 22 mm fitting would be helpful. How are such valves > called, and who may sell them? You can probably make something very simple - you just need a flap of reasonable thick rubber material and attach it by one edge to your tube so it just covers a suitable sized hole. When you exhale the rubber will blow out of the way and air exit the hole - on breathing in the rubber will seat over the hole firmly and block and airflow. I seem to remember small 2 stroke motorcyle carburettors having a flap system like this - perhaps you could find two at a scrapyard. > Hi scuba experts, > [quoted text clipped - 7 lines] > Fitting a standard 22 mm fitting would be helpful. How are such valves > called, and who may sell them? They're called duckbills, they were widely used in the oldy days, and they are still available from anyone who services double hose regs. Try http://www.vintagescubasupply.com/ esg > Hi scuba experts, > [quoted text clipped - 7 lines] > Fitting a standard 22 mm fitting would be helpful. How are such valves > called, and who may sell them? http://www.clearpvcpipe.com/index.asp?PageAction=VIEWCATS&Category=35 These are called swing check valves. I've seen them from 1/2" up. We use this type where I work to keep water on the suction side of a pump so we don't have to prime it every time we want to turn it on. We use them on air lines too, to keep air from flowing back when the blower is turned off. They work great for water, but air will slowly hiss by the flapper. Signature</Tazz> > runcyclexc...@gmail.com wrote: > > Hi scuba experts, [quoted text clipped - 17 lines] > is turned off. They work great for water, but air will slowly hiss by > the flapper. These look like what I need. In addition, the site has all sorts of useful pipes and fittings. And the flapper idea posted above is very elegant, too! Hey - another question then, if I may. The snorkel (this is what it's called now) I am building uses plastic tubing. The plastic tubing introduces a very distinct and annoying smell of plastic into the air I am breathing. Is there a material/coating for tubing that is smell- free? >> runcyclexc...@gmail.com wrote: >>> Hi scuba experts, [quoted text clipped - 25 lines] > I am breathing. Is there a material/coating for tubing that is smell- > free? Maybe soak it water mixed with baking soda? Sorry can't help you there. Signature</Tazz>
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