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#11
posted to rec.boats.cruising
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Joker Valves (was) Question for Peggie
BF wrote:
I've never seen a joker valve (lots of duck bills though). Hmmmm....we may be talking about the same part, but Jabsco, Wilcox-Crittenden, Groco and Jabsco all call it a joker valve in their exploded parts views. The only mfr who calls 'em duckbills is SeaLand. From my visualization of your description what is probably happening when you over-tighten the screws is not puckering of the sealing surface... Yes, it is a puckering of single piece of rubber (the flange on the joker valve) between the flange on the on discharge fitting and the pump body. If over-tightened screws are backed out a bit within a short period of time, the rubber regains its shape and seals the leak...but if the screws remain too tight long enough, they deform the rubber permanently...the only fix is a new joker valve. but deformation of the flanges between the screw points causing a reduction in pressure between the two flange surfaces. Huh???? O-rings seals, when properly designed and manufactured should be assembled with their flanges in contact with each other, ie bottomed out. Obviously referring to face seals here and not radial o-ring seals. I think you just WAY over-complicated something that's really very simple... All we're talking about here is two pieces of hardware (usually hard PVC, but can be bronze on older toilets) with a flat piece of rubber between 'em, held together by 2 or 4 screws. You can see the parts in question in the exploded drawing of the Groco Headmate he http://www.groco.net/images/toilets/...-SM/HF-pg2.jpg (click on the drawing to enlarge it to a readable size)... parts #14 (discharge fitting connector) and 4 (pump body) with part #16 (joker valve) between 'em). It's the same on all toilets, and you can see by also going to the drawing for the Raritan PH II he http://www.raritaneng.com/pdf_files/...Ephiiv0303.pdf -- Peggie ---------- Peggie Hall Specializing in marine sanitation since 1987 Author "Get Rid of Boat Odors - A Guide To Marine Sanitation Systems and Other Sources of Aggravation and Odor" http://www.seaworthy.com/store/custo...0&cat=6&page=1 http://shop.sailboatowners.com/books...ku=90&cat=1304 |
#12
posted to rec.boats.cruising
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Joker Valves (was) Question for Peggie
Peggy:
I now have two new questions. Both illustrations of the joker valve show it aligned in a vertical position. Is this necessary? I just took my head apart and there was an 1/8" gap between the lips so it leaked sewage back into the head. I don't remember what the orentation of the slit was. Second. I saw a three "lip" joker valve at West marine. Is that a better arangement than the two lip valves shown in the diagrams? Thanks for any information. bill Bill Deutschman, PhD Providing Laser Safety Training, Oregon Laser Consultants Safety Audits, Computer Safety 455 Hillside Avenue Programs and CDRH Certification Klamath Falls OR 97601-2337 for Laser Users. 541.882.3295 |
#13
posted to rec.boats.cruising
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Joker Valves (was) Question for Peggie
I now have two new questions. Both illustrations of the joker valve show it aligned in a vertical position. Is this necessary? When all else fails, follow the directions. A vertical alignment does a better job of preventing leakage than horizontal...and in some toilets, the fitting isn't exactly round. The joker valve only fits correctly if aligned as shown in the drawing. I just took my head apart and there was an 1/8" gap between the lips so it leaked sewage back into the head. That's a good sized gap...and illustrates why joker valves should be replaced at LEAST every two years...every year if you live aboard. However a joker valve isn't supposed to prevent slow seepage, only a flood. I suspect you aren't flushing long enough in the "dry" mode (if you ever flush in the dry mode at all) to move the waste over the top of the vented loop. Even if you have an electric toilet that doesn't have a "dry" mode, the only thing that should run or seep back into the bowl is clean flush water...if waste is running back, you aren't flushing long enough. I don't remember what the orentation of the slit was. Check the drawing for your toilet. If you don't have a drawing, you can prob'ly pull one off the mfr's website...what's the make/model? Second. I saw a three "lip" joker valve at West marine. Is that a better arangement than the two lip valves shown in the diagrams? The jury is out on that one. The X or + pattern was supposed to be an improvement over the slit...but I know of a couple of mfrs who tried it, then went back to the slit. Have a happy Thanksgiving, y'all! -- Peggie ---------- Peggie Hall Specializing in marine sanitation since 1987 Author "Get Rid of Boat Odors - A Guide To Marine Sanitation Systems and Other Sources of Aggravation and Odor" http://www.seaworthy.com/store/custo...0&cat=6&page=1 http://shop.sailboatowners.com/books...ku=90&cat=1304 |
#14
posted to rec.boats.cruising
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Joker Valves (was) Question for Peggie
Sorry Peggie, I seem to have lost you somewhere along the line.
Two topics, duck bill valves and o-rings. Very different things, indeed. A "duck bill valve" is a type of valve like a "ball valve", "globe valve", "check valve", etc. I'm not personally familiar with "joker valves" but my comments regarding probable causes of leaks when the attaching screws are "over tightened" is still a viable probability. At least as I visualize a joker valve. My comments regarding o-ring was in response to a comment of yours that either said or implied that over tightening screws on an o-ring seal would cause leakage. Obviously one should never "over tighten" any screws but the probable failure in an o-ring seal situation is stripped or broken screws and not leakage. An o-ring seal will be designed to have the flanges fully closed when assembled. BF "Peggie Hall" wrote in message news BF wrote: I've never seen a joker valve (lots of duck bills though). Hmmmm....we may be talking about the same part, but Jabsco, Wilcox-Crittenden, Groco and Jabsco all call it a joker valve in their exploded parts views. The only mfr who calls 'em duckbills is SeaLand. From my visualization of your description what is probably happening when you over-tighten the screws is not puckering of the sealing surface... Yes, it is a puckering of single piece of rubber (the flange on the joker valve) between the flange on the on discharge fitting and the pump body. If over-tightened screws are backed out a bit within a short period of time, the rubber regains its shape and seals the leak...but if the screws remain too tight long enough, they deform the rubber permanently...the only fix is a new joker valve. but deformation of the flanges between the screw points causing a reduction in pressure between the two flange surfaces. Huh???? O-rings seals, when properly designed and manufactured should be assembled with their flanges in contact with each other, ie bottomed out. Obviously referring to face seals here and not radial o-ring seals. I think you just WAY over-complicated something that's really very simple... All we're talking about here is two pieces of hardware (usually hard PVC, but can be bronze on older toilets) with a flat piece of rubber between 'em, held together by 2 or 4 screws. You can see the parts in question in the exploded drawing of the Groco Headmate he http://www.groco.net/images/toilets/...-SM/HF-pg2.jpg (click on the drawing to enlarge it to a readable size)... parts #14 (discharge fitting connector) and 4 (pump body) with part #16 (joker valve) between 'em). It's the same on all toilets, and you can see by also going to the drawing for the Raritan PH II he http://www.raritaneng.com/pdf_files/...Ephiiv0303.pdf -- Peggie ---------- Peggie Hall Specializing in marine sanitation since 1987 Author "Get Rid of Boat Odors - A Guide To Marine Sanitation Systems and Other Sources of Aggravation and Odor" http://www.seaworthy.com/store/custo...0&cat=6&page=1 http://shop.sailboatowners.com/books...ku=90&cat=1304 |
#15
posted to rec.boats.cruising
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Joker Valves (was) Question for Peggie
Sorry Peggie, I seem to have lost you somewhere along the line.
Two topics, duck bill valves and o-rings. Very different things, indeed. Yes...they are. Dave originally posted a question about an o-ring...the topic drifted to joker valves. A "duck bill valve" is a type of valve like a "ball valve", "globe valve", "check valve", etc. It's also a rubber one-way valve...if you go here http://www.sealandtechnology.com/prodrplc.asp and scroll almost to the bottom of the page, you'll see (though not very well) a pair of 'em. I'm not personally familiar with "joker valves"... If you own a boat that has a toilet, you've apparently never done any maintenance work on it...'cuz every marine toilet has one, and it gets blamed--unjustly 99% of the time--for just about every toilet problem. People even replace joker valves in an attempt to solve problems in the flush water intake! but my comments regarding probable causes of leaks when the attaching screws are "over tightened" is still a viable probability. At least as I visualize a joker valve... If you'll go to the drawings at links I posted previously, you won't have to visualize one...you can see one. My comments regarding o-ring was in response to a comment of yours that either said or implied that over tightening screws on an o-ring seal would cause leakage. Overtightening screws on a GASKET...I'm not familiar with any application using o-rings in which screws would be used. Obviously one should never "over tighten" any screws but the probable failure in an o-ring seal situation is stripped or broken screws and not leakage. An o-ring seal will be designed to have the flanges fully closed when assembled. What if there are no flanges? Which there wouldn't be in the application (threaded male cap with round o-ring between it and the female port in the tank) that Dave asked about. Remember, we're not talking about a seal that will have any pressure on it--as it would in a pipe connection--just a cap in a hole in the top of a tank. It only needs to be sealed sufficiently to prevent gasses from escaping from a non-pressurize tank. -- Peggie ---------- Peggie Hall Specializing in marine sanitation since 1987 Author "Get Rid of Boat Odors - A Guide To Marine Sanitation Systems and Other Sources of Aggravation and Odor" http://www.seaworthy.com/store/custo...0&cat=6&page=1 http://shop.sailboatowners.com/books...ku=90&cat=1304 |
#16
posted to rec.boats.cruising
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Joker Valves (was) Question for Peggie
"Peggie Hall" wrote in message om... Sorry Peggie, I seem to have lost you somewhere along the line. Two topics, duck bill valves and o-rings. Very different things, indeed. Yes...they are. Dave originally posted a question about an o-ring...the topic drifted to joker valves. A "duck bill valve" is a type of valve like a "ball valve", "globe valve", "check valve", etc. It's also a rubber one-way valve...if you go here http://www.sealandtechnology.com/prodrplc.asp and scroll almost to the bottom of the page, you'll see (though not very well) a pair of 'em. I'm not personally familiar with "joker valves"... If you own a boat that has a toilet, you've apparently never done any maintenance work on it...'cuz every marine toilet has one, and it gets blamed--unjustly 99% of the time--for just about every toilet problem. People even replace joker valves in an attempt to solve problems in the flush water intake! Don't! Just charter. but my comments regarding probable causes of leaks when the attaching screws are "over tightened" is still a viable probability. At least as I visualize a joker valve... If you'll go to the drawings at links I posted previously, you won't have to visualize one...you can see one. My comments regarding o-ring was in response to a comment of yours that either said or implied that over tightening screws on an o-ring seal would cause leakage. Overtightening screws on a GASKET...I'm not familiar with any application using o-rings in which screws would be used. I've designed more than I would want to count. Almost all face seal applications will involve some type of fastener, the exception being threaded tube in a tube. Obviously one should never "over tighten" any screws but the probable failure in an o-ring seal situation is stripped or broken screws and not leakage. An o-ring seal will be designed to have the flanges fully closed when assembled. What if there are no flanges? Which there wouldn't be in the application (threaded male cap with round o-ring between it and the female port in the tank) that Dave asked about. Remember, we're not talking about a seal that will have any pressure on it--as it would in a pipe connection--just a cap in a hole in the top of a tank. It only needs to be sealed sufficiently to prevent gasses from escaping from a non-pressurize tank. -- Peggie By definition a face seal has flanges (flanges = sealing faces). A radial seal as you describe above may or may not require fasteners. But the main point you missed is that my comments were meant to be generic, not specific to Dave's problem. I just want to correct what some people may have understood from your message, ie that one should NEVER tighten o-ring seal screws fully. That may not have been what you intented but that was the way I read it and therefore a possibility others could have read it that was. You, being an acknowledged expert, anyone reading the same as me and not knowing otherwise, may have taken it as truth. BF ---------- Peggie Hall Specializing in marine sanitation since 1987 Author "Get Rid of Boat Odors - A Guide To Marine Sanitation Systems and Other Sources of Aggravation and Odor" http://www.seaworthy.com/store/custo...0&cat=6&page=1 http://shop.sailboatowners.com/books...ku=90&cat=1304 |
#17
posted to rec.boats.cruising
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Joker Valves (was) Question for Peggie
In article ,
Peggie Hall wrote: Second. I saw a three "lip" joker valve at West marine. Is that a better arangement than the two lip valves shown in the diagrams? The jury is out on that one. The X or + pattern was supposed to be an improvement over the slit...but I know of a couple of mfrs who tried it, then went back to the slit. Here's a vote against the three "lip" jokers. -- Jere Lull Xan-a-Deux ('73 Tanzer 28 #4 out of Tolchester, MD) Xan's Pages: http://members.dca.net/jerelull/X-Main.html Our BVI FAQs (290+ pics) http://homepage.mac.com/jerelull/BVI/ |
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