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Post by surflung on Jun 4, 2024 5:59:03 GMT -8
Jeff's Over Pressure regulator and unique Twin Tank set-up... - Jeff was able to get Russian hoses to fit from Rob's Scuba Museum... I think the rarity of the DX Over Pressure regs is due to so many of them being converted to Stream Airs and Mistrals. That mouthpiece that connects to the hose within a hose was probably swapped out and lost in the process as well. Jeff took it all apart and I was able to see the unique design of the mouthpiece as well as the very similar design of the regulator mechanism to the Mistral we're all familiar with. - Jeff said he was able to read our forums but not able to join. I don't know if that was just the VDH forum or this one as well. I sent an email to Ron at the VDH forum with Jeff's contact info. I think he should be able to join this forum okay.
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Post by artc on Jun 4, 2024 9:23:57 GMT -8
Is Jeff using the original inner hose or did he fabricate a new one? If new, how did he connect the hose to the mechanism? Also, how did he fabricate the one way valve? John (SeaRat) had a good setup when he rebuilt his DX OP.
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Post by jeffinmichigan on Jun 4, 2024 17:12:58 GMT -8
Is Jeff using the original inner hose or did he fabricate a new one? If new, how did he connect the hose to the mechanism? Also, how did he fabricate the one way valve? John (SeaRat) had a good setup when he rebuilt his DX OP. Hello Jeff here I did have to fabricate a new hose. The original was crumbling to the fabric layer and was not salvageable. With the intent to reuse the fitting of the hose, I took a Dremel with a burr and cut off the swaged compression collar. This is where it gets kind of goofy. The mouthpiece uses a 1/4" hose barb with a spring clip, but the compression fitting was over a ~1/8" hose barb. Went to the local hydraulic/pneumatic supply store with a small piece of the hose and asked for 3' of their equivalent. They also recommended pinch clips(pinch on double ear clips) to secure the hose over the barb. The barb was then silver soldered inside of a 1/4" barb.(no airway modification, just external surface) This increase in diameter however forces the mechanism away from the regulator can. To accommodate the additional offset, when replacing the gasket that goes between the can and the mechanism. I used cork (cut your gasket) gasket sheet for it's increased thickness. For the one-way valve. To start I continued to use both it and the original duckbill. Both are in remarkable condition.(duckbill has been swapped out) I was able to remove the one way valve in one piece, although the retainer tabs look a bit chewed. It's replacement was 1/16" silicone sheet cut to the same shape and punched holes where the tabs had been. Long story short... the flap is then "riveted" in place on the original one-way body.(there is only a one-way on the inhalation hose side of the mouthpiece) The duckbill was swapped out to a duckbill replacement. The seating depth flange has to be removed from the replacement to locate the valve in the center of the can. This is due to the increased internal extension of the exhaust horn, originally meant to mount the early duckbill. Russian surplus hoses are a bit small. (assuming 25mm) Regrettably the options for hoses are limited.(at one point I had 22" bcd hoses on it) I'll keep an eye on this for a few days if you have any questions. Jeff |
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Post by scubalawyer on Jun 4, 2024 18:05:57 GMT -8
Is Jeff using the original inner hose or did he fabricate a new one? If new, how did he connect the hose to the mechanism? Also, how did he fabricate the one way valve? John (SeaRat) had a good setup when he rebuilt his DX OP. Hello Jeff here I did have to fabricate a new hose. The original was crumbling to the fabric layer and was not salvageable. With the intent to reuse the fitting of the hose, I took a Dremel with a burr and cut off the swaged compression collar. This is where it gets kind of goofy. The mouthpiece uses a 1/4" hose barb with a spring clip, but the compression fitting was over a ~1/8" hose barb. Went to the local hydraulic/pneumatic supply store with a small piece of the hose and asked for 3' of their equivalent. They also recommended pinch clips(pinch on double ear clips) to secure the hose over the barb. The barb was then silver soldered inside of a 1/4" barb.(no airway modification, just external surface) This increase in diameter however forces the mechanism away from the regulator can. To accommodate the additional offset, when replacing the gasket that goes between the can and the mechanism. I used cork (cut your gasket) gasket sheet for it's increased thickness. For the one-way valve. To start I continued to use both it and the original duckbill. Both are in remarkable condition.(duckbill has been swapped out) I was able to remove the one way valve in one piece, although the retainer tabs look a bit chewed. It's replacement was 1/16" silicone sheet cut to the same shape and punched holes where the tabs had been. Long story short... the flap is then "riveted" in place on the original one-way body.(there is only a one-way on the inhalation hose side of the mouthpiece) The duckbill was swapped out to a duckbill replacement. The seating depth flange has to be removed from the replacement to locate the valve in the center of the can. This is due to the increased internal extension of the exhaust horn, originally meant to mount the early duckbill. Russian surplus hoses are a bit small. (assuming 25mm) Regrettably the options for hoses are limited.(at one point I had 22" bcd hoses on it) I'll keep an eye on this for a few days if you have any questions. Jeff Hi Jeff. Welcome! You did an awesome job on the Overpressure rebuild. A Dremel is one of my most-used tools in dive gear repair/modification! I just used my Dremel to modify a reel on my Riffe Halibut speargun. 😎 |
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Post by SeaRat on Jun 4, 2024 18:34:55 GMT -8
Is Jeff using the original inner hose or did he fabricate a new one? If new, how did he connect the hose to the mechanism? Also, how did he fabricate the one way valve? John (SeaRat) had a good setup when he rebuilt his DX OP. Hello Jeff here I did have to fabricate a new hose. The original was crumbling to the fabric layer and was not salvageable. With the intent to reuse the fitting of the hose, I took a Dremel with a burr and cut off the swaged compression collar. This is where it gets kind of goofy. The mouthpiece uses a 1/4" hose barb with a spring clip, but the compression fitting was over a ~1/8" hose barb. Went to the local hydraulic/pneumatic supply store with a small piece of the hose and asked for 3' of their equivalent. They also recommended pinch clips(pinch on double ear clips) to secure the hose over the barb. The barb was then silver soldered inside of a 1/4" barb.(no airway modification, just external surface) This increase in diameter however forces the mechanism away from the regulator can. To accommodate the additional offset, when replacing the gasket that goes between the can and the mechanism. I used cork (cut your gasket) gasket sheet for it's increased thickness. For the one-way valve. To start I continued to use both it and the original duckbill. Both are in remarkable condition.(duckbill has been swapped out) I was able to remove the one way valve in one piece, although the retainer tabs look a bit chewed. It's replacement was 1/16" silicone sheet cut to the same shape and punched holes where the tabs had been. Long story short... the flap is then "riveted" in place on the original one-way body.(there is only a one-way on the inhalation hose side of the mouthpiece) The duckbill was swapped out to a duckbill replacement. The seating depth flange has to be removed from the replacement to locate the valve in the center of the can. This is due to the increased internal extension of the exhaust horn, originally meant to mount the early duckbill. Russian surplus hoses are a bit small. (assuming 25mm) Regrettably the options for hoses are limited.(at one point I had 22" bcd hoses on it) I'll keep an eye on this for a few days if you have any questions. Jeff Jeff, Welcome here!!! I am the one who has the other functioning DX Overpressure Breathing regulator in this forum.  IMG_1181 by John Ratliff, on Flickr I have put a long yoke on mine, so as to have a Banjo behind it for a SPG. I took a different tract with the hoses, and procured two SCBA hoses with one-inch diameter ends, which were perfect for the metal mouthpiece.  DX Overpressure Schematic by John Ratliff, on Flickr Here's the original parts diagram for the DX Overpressure Breathing regulator, so others can see what we're talking about with the hose inside the hose.  IMG_2204 by John Ratliff, on Flickr Here's how I got the non-return onto the disc.  IMG_2203 by John Ratliff, on Flickr The non-return is held by dental floss, for its strength. John |
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Post by artc on Jun 4, 2024 20:08:13 GMT -8
Aloha Jeff, welcome to the forum and thanks for answering my questions on the DX Overpressure. I’m interested in how you rebuilt the regulator because I’d like to do the same on mine. My 1954 Overpressure is a functioning original that works breathes as as it should. The 70 year old inner hose is in decent shape, but I’m concerned that it cannot handle the rigors of an actual dive to recreational depths. I rebuilt the non return valve per John’s (Sea Rat) instructions and it works great. The original duckbill looks new and also works great. If I can replace the inner hose with a new one, I’ll definitely take it in the ocean.
If you have any photos of your rebuild, I’d be very interested and appreciative of seeing them. I’m particularly interested in how you built the hose barb connection to the main body mechanism. Looking forward to more posts and advice from you. Thanks again
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Post by jeffinmichigan on Jun 5, 2024 3:40:33 GMT -8
Hello again
I am very willing to share my rebuild process. I will not endorse it as safe to use... liability. I do have some pictures, for the sake of the build tutorial it seam's I should do, better quality are called for.
John, I have read a good number of your posts. I just noticed on the diagram, that originally there looks to be a gasket separate from the diaphragm. When I removed the existing diaphragm it was a single piece of hardened grey rubber with a brass plate riveted to it. Is there something I missed, or a design revision?
Should I do further rebuild review here or start a dedicated post?
Jeff
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Post by vance on Jun 5, 2024 6:25:53 GMT -8
Hi Jeff, and welcome! A new thread is appropriate, or add to an existing thread specifically about the O-P. BTW, there are some 1" gasmask hoses available that are inexpensive and work well.
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Post by artc on Jun 5, 2024 8:03:34 GMT -8
Hi Phil, where can we pickup those 1” gas mask hoses? Thanks.
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Post by vance on Jun 5, 2024 9:43:44 GMT -8
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Post by artc on Jun 5, 2024 10:34:11 GMT -8
Thanks Phil, I just picked up four of those. You da man!
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Post by surflung on Jun 5, 2024 11:26:24 GMT -8
Dive Gear Express has some neat corrugated hoses for BCDs. They have 1" ends and a unique oval shape. DGX Corrugated Hoses |
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Post by jeffinmichigan on Jun 5, 2024 15:04:08 GMT -8
Dive Gear Express has some neat corrugated hoses for BCDs. They have 1" ends and a unique oval shape. DGX Corrugated HosesThe pair of BCD hoses that were used are the ovoid, low profile hose. They work and sat on the shoulders nicely. Getting them clocked to the right position for that took a bit of time. Also thought I'd mention. Due to reading that there was a sensation of forced air. I installed an angled mouthpiece to ?diffuse/deflect? the stream. I'll take pictures shortly and post a build background. Jeff |
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Post by vance on Jun 5, 2024 16:10:01 GMT -8
OK, enough interest to bring up a new thread which is obviously done. Do we need a new one about 1" GM hoses?
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Post by SeaRat on Jun 5, 2024 16:15:21 GMT -8
Dive Gear Express has some neat corrugated hoses for BCDs. They have 1" ends and a unique oval shape. DGX Corrugated HosesThe 22 inch hoses would work, but the others will be too short. John |
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