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Post by SeaRat on Jun 8, 2020 14:26:02 GMT -8
It's a very restricted mp/non-return valve system. It obviously worked for many divers for many years, but it can be vastly improved by a larger hoseloop. They throttled the performance down too far by putting a 7/8" non return in the loop. One has to wonder why. I have a feeling that both Healthways and AMF Voit decided to restrict their double hose regulators to shift divers to single hose regulators. Healthways under-sized their Gold Label Scuba regulator to ensure their Scubair line sold well, and Voit turned the Venturi system on their Fifty Fathom double hose around (small hole toward the inhalation horn, not the large one) to help secure the Voit 40 Fathom single hose regulator (Calypso equivalent). 'Just my thought, but it is the only really logical reason for doing so. John |
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Post by vance on Jun 25, 2020 9:29:22 GMT -8
ScubaLawyer invited me to throw my 3d printer at the exhaust diaphragm problem.... If somebody could give me measurements (preferably metric on the oval lip it seals to, I'll model something up and try it. Just to manage expectations, the material at hand is duro 95 urethane, so I'll do my best but think Mark's method is probably going to be a superior product! Respectfully, James
I was considering how to utilize the 3D printer with this part. Is there a flexible enough plastic to make one out of? I was thinking a bit differently about it, though. How about a slightly flexible retainer that can be shoved over a piece of rubber sheet (like an o-ring, but flat), and then clamped with a stainless clamp? |
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Post by scubalawyer on Jun 27, 2020 13:09:28 GMT -8
So why is the exhaust side of a Hope-Page smaller in diameter than the inhalation side?   I'm thinking maybe to prevent blow-by? |
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Post by SeaRat on Jun 27, 2020 14:03:25 GMT -8
So why is the exhaust side of a Hope-Page smaller in diameter than the inhalation side? I'm thinking maybe to prevent blow-by? Well, that's interesting because the Hope-Page mouthpiece preceeded Venturi use in double hose regulators. The Hope-Page mouthpiece was available for the original Healthways Scuba, but even before that it was available for the DA Aqualung by U.S. Divers Company, and sold by U.S.D. as a replacement for their single, molded hose/mouthpiece that was without non-return valves. I think it had to do with providing some backflow/turbulence at the exhaust end of the mouthpiece to encourage air flow into the mouthpiece. But by the time the Gold Label Healthways came into being, Healthways had discarded the Hope-Page mouthpiece in favor of their own design (which I really did not like). So I don't think we can really say that it was to prevent blow-by, but maybe just to encourage air flow into the mouthpiece. John |
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Post by nikeajax on Jun 27, 2020 14:25:50 GMT -8
I think it had/has something to do with the way in which one places the exhaust wagon wheel: that is so you don't put it in backwards  JB |
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Post by james1979 on Jun 27, 2020 15:12:22 GMT -8
My guess is that with the flat valve carriers, it needed the larger diameter to give the valve room to open on the intake side. And the exhaust side would have that accomplished in the fitting. I'll bet the exhaust side is pretty close to the inner diameter of the openings on the valve carriers.
Just my guess though,
Respectfully,
James
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Post by vance on Jun 27, 2020 15:41:09 GMT -8
Cool... Hopefully I'll be able to spend some time on it tomorrow. Should be easy to model... getting a viable print is the real question! And I'm understanding 2 different ideas: 1) just a straight up printed diaphragm (I have my reservations about how well this will work due to the material). 2) A formed retainer ring with a lip, basically to hold nitrile glove material or the like in place and protect it from the clamp. That sound about right? Yes. A flat collar that is slightly stretchy so it can be weaseled over the lip and then will destretch to fit tight-ishly around the flange. A flat clamp like I made would be best to hold that tight, rather than the wire, I think. The flat collar will help with both the installation of the rubber sheet, and would protect the sheet material from being cut by the clamp. |
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Post by SeaRat on Jun 27, 2020 17:13:14 GMT -8
My guess is that with the flat valve carriers, it needed the larger diameter to give the valve room to open on the intake side. And the exhaust side would have that accomplished in the fitting. I'll bet the exhaust side is pretty close to the inner diameter of the openings on the valve carriers. Just my guess though, Respectfully, James James, I just looked at mine, on my DA Aqualung regulator right now. Yes, your observation is correct, the exhaust is the same internal diameter as the opening, which would make it impossible to put the wagonwheel on backwards (JB, I think you also are correct). John |
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Post by SeaRat on Jun 27, 2020 17:15:11 GMT -8
My guess is that with the flat valve carriers, it needed the larger diameter to give the valve room to open on the intake side. And the exhaust side would have that accomplished in the fitting. I'll bet the exhaust side is pretty close to the inner diameter of the openings on the valve carriers. Just my guess though, Respectfully, James James, I just looked at mine, on my DA Aqualung regulator right now. Yes, your observation is correct, the exhaust is the same internal diameter as the opening, which would make it impossible to put the wagonwheel on backwards (JB, I think you also are correct). John |
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Post by scubalawyer on Jun 28, 2020 8:24:37 GMT -8
Something else I had never noticed with the Hope-Page. The wagon wheels are specific to inhalation and exhalation sides. This can be seen in two ways. First, there are small round mold marks on the wagon wheels; however, they are on different sides on the two wagon wheels (ridge and non-ridge) so that the valve can lay flat on a smooth surface (the opposite side of where the round mold marks are). Second, the hole in the middle of the wagon wheel is recessed on the mold-mark side of each. Again, to accommodate the valve itself laying flat on the opposite side. Hope I'm making sense and that this isn't something everyone already knew.  Bottom line is that using the correct wheel on the correct side with the correct orientation is important. My 2psi. Mark    |
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Post by james1979 on Jun 28, 2020 9:07:15 GMT -8
Whoever did the tooling/mold designs for that was thinking... Keeping the injection points away from the sealing surface by putting them on the opposite side is smart. It does, unfortunatley, make them side specific like you said... but that's small potatoes in the grand scheme of things!
Respectfully,
James
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Post by nikeajax on Jun 28, 2020 9:53:43 GMT -8
Mark, yes, sorry, I meant to include what you just articulated so well in my first response, so thank you JB |
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Post by tomcatpc on Jun 28, 2020 14:23:48 GMT -8
Still in shock a topic I created is still going on, i might as well say something now and then.
Mark
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Post by scubalawyer on Jul 2, 2020 13:02:08 GMT -8
I'm sure it has been shared somewhere on this forum, but can anyone point me to a parts diagram for a Healthways SCUBA? VDH only has the GL and the Deluxe parts diagram.
Thanks,
Mark
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Post by scubalawyer on Jul 2, 2020 14:37:22 GMT -8
I'm sure it has been shared somewhere on this forum, but can anyone point me to a parts diagram for a Healthways SCUBA? VDH only has the GL and the Deluxe parts diagram. Thanks, Mark Never mind - I found one. |
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Bottom line is that using the correct wheel on the correct side with the correct orientation is important. My 2psi. Mark
