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Post by nikeajax on Aug 6, 2018 13:23:24 GMT -8
 A few weeks ago John decided he was going to do a Marlin Brando imitation on me, "I'm gunna make you an offer you can't refuse..." What was that offer? His LDS had a couple of Scubas and did I want one for cheap? Aww-geeze-eh! He knows my weakness, as he's the one who got me hooked on this stuff. So I'm going to document my restoration... JB   |
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Post by nikeajax on Aug 8, 2018 13:10:15 GMT -8
Here are some more images before I clean things up: if you look at the second image as well as this one you can see a termite, or ant, wing sticking to the exhaust diaphragm!  The yoke screw is bent and the sintered filter is very clogged with schmootz: gunna try to save it.  There is what appears to be shellac on this reg, you can see it on the Hope-Page: it looks like dried blood. JB |
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Post by Aquala1 on Aug 8, 2018 14:16:03 GMT -8
Good score. I recently took my Scuba apart, and I know the answer is around here on the forum somewhere, but how does the exhaust escape through that diaphragm?
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Post by nikeajax on Aug 8, 2018 14:17:47 GMT -8
So... here's one method for realigning the valve body to get better air-flow:  Just twist the effing-thing! Mark, are you paying attention-- SNORT! I didn't get an image, but whoever owned this reg, just turned everything without much thought behind what they were doing: the valve body gasket was very distorted, and is now an ellipse with perhaps 1mm sealing the cans  So these older translucent type of valve plungers are buoyant except for the little metal nose where it makes contact with the actuator: they're more like the Divairs: here's a side-by-side with the newer style:  JB |
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Post by nikeajax on Aug 8, 2018 14:19:52 GMT -8
Ty, it doesn't:  Hopefully my illustration makes sense to you  JB |
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Post by Aquala1 on Aug 8, 2018 14:26:25 GMT -8
Ty, it doesn't: Hopefully my illustration makes sense to you JB That makes perfect sense. So, why didn’t Healthways just eliminate that hole altogether and not just cover it with a diaphragm? Maybe the answer lies with the invention of a time machine. |
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Post by nikeajax on Aug 8, 2018 14:55:31 GMT -8
The flexible diaphragm is supposed to seat on the end of the air-horn working in tandem with the duck bill the air pressure in the can seals it up: it's a weird set up but it does work. My previous answer is something that needs to be thought about because though it is a diaphragm, it doesn't work like a mushroom-valve. I think a lot of people over analyze how it works, it's kind of a Zen-thing: they're expecting the diaphragm to exhaust the gasses into the can, and really confuses the ca-ca out of them. Also, in my image showing the twisted valve body, please note the depth compensating restrictor plate with the tiny hole next to the valve-plunger  JB |
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Post by SeaRat on Aug 8, 2018 15:18:04 GMT -8
Here's the photo I sent to Jaybird with the two regulators, and I had him choose which one he wanted:  Ty, it doesn't: Hopefully my illustration makes sense to you JB Let me shine some light on this, the Healthways Scuba (orginial) exhaust system. First, this exhaust system was developed to get around the Cousteau patent for the Aqualung exhaust system, with the duckbill. The Healthways system was to use the diaphragm exclusively. In its initial release, there was no duckbill, and it actually functions quite well, with one exception, without the duckbill. That exception is when the diver is in a head-down dive.  This is the Cousteau patented exhaust system, the duckbill.  Here is the Dacor Double Diaphragm two-stage regulator, which got around the Cousteau patent with the double diaphragm exhaust. Realize that there is a difference in pressure between the main diaphragm and the exhaust diaphragm. This is enough, in most positions, to seal the exhaust diaphragm against the exhalation tube. To visualize this, you need to know that there are two slight errors in Jaybirds diagram. The first is that the exhalation tube/horn extends almost to the exhalation diaphragm. The second is that the duckbill does not extend beyond the edges of the exhaust horn, allowing the exhaust diaphragm to seal against the horn. The duckbill is only useful when the diver is in the head-down position, and not exhaling; in that position, the difference in air pressure inside the box of the Healthways Scuba is negligible, and the exhaust diaphragm can be unsealed, allowing water to go into the exhalation hose. I have used my Healthways Scuba (first generation) without the duckbill, and it works quite well, except that you need to clear the hose when head-down for any time. Actually, it breathes easier in exhalation than any other configuration.  If you look clasely at the exhaust diaphragm of the Healthways Scuba (my newest addition, before cleaning), you'll see that the diaphragm actually has an indentation where it seals against the exhaust tube.  In this photo, you can see the exhaust duckbill in its original position before I cleaned the regulator. Note that the duckbill does not extend beyond the edge of the exhaust tube. I hope this helps to understand the physics of this exhaust system, and why it was developed. John |
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Post by nikeajax on Aug 9, 2018 7:56:38 GMT -8
I have a cat that's pretty old, 15-years, he always wants me to brush him... As I sat on the couch giving him lovings, I was looking at my Scuba and the cracked diaphragm thinking, maybe I can use some of Phil's famous glue to repair it, I still may. But then I looked at a really nice MR-12 diaphragm I had sitting there: it was the old type, that separates from the friction plate and John was kind enough to send me a silicone one. I'm pretty danged sure that this Voit-diaphragm will work in place of the HW's!!!!! So Mark, John and Phil: I know you guys have both MR-12s and Scubas, this may be what we've been looking for... JB |
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Post by nikeajax on Aug 9, 2018 9:37:10 GMT -8
It needs some shaping, but, yes, it works!  JB  |
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Post by nikeajax on Aug 9, 2018 11:32:34 GMT -8
Ty, another really neat thing about these is how trim they are:  Having both air horns on the same can gives them a great silhouette that allows you to lower your reg as far down as you want it! JB |
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Post by tomcatpc on Aug 10, 2018 7:29:36 GMT -8
I need to find another Healthways double hose someday, also need to find my first Hope-Page mouthpiece...
Groovy find about the diaphragm!
Mark
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Post by SeaRat on Aug 10, 2018 14:29:36 GMT -8
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Post by vance on Aug 10, 2018 19:17:35 GMT -8
That one has no case ring clamp!
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Post by SeaRat on Aug 10, 2018 22:27:39 GMT -8
That one has no case ring clamp! Yes, but you can take the guts of the Gold Label, put them into the box of an original Healthways Scuba, and have a hybrid Healthways Scuba. It has the best of both, the breathing inhalation better than a Mistral, and an exhalation system which uses the original Healthways patented system, which is in my opinion better than a duckbill USD exhaust. John |
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