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Post by cablehack on Nov 21, 2017 22:00:13 GMT
I got it to pull down to 20lbs I figured that was pretty good? I let it sit for about 30min and it held.. I think you might mean inches (of mercury), not pounds. The system should pull down to at least 29" if there's no leaks. Having said that, I would expect 20" to probably work if the system is clean with no moisture inside. The hermetic kit adaptors are prone to leak. The gland around the valve shaft might need tightening to start with. The charge valve connection is the other source of leaks. I never found the copper washers supplied to be effective. I made a lead washer which was better, but ultimately fixed the problem with a neoprene O ring.
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Post by solarmike on Nov 21, 2017 23:01:27 GMT
LOL Yes sir "lbs... Heck I'm just glad it's working correctly... LOL I'm sure it had to have some leaks at a heavy vacuum with all the fittings but it holding for 30 min at 20" I was happy.. When I first started it would pull down to 20" lbs and would leak off in about ten seconds... LOL
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Post by timeswelding on Nov 21, 2017 23:13:20 GMT
I got it to pull down to 20lbs I figured that was pretty good? I let it sit for about 30min and it held.. I think you might mean inches (of mercury), not pounds. The system should pull down to at least 29" if there's no leaks. Having said that, I would expect 20" to probably work if the system is clean with no moisture inside. The hermetic kit adaptors are prone to leak. The gland around the valve shaft might need tightening to start with. The charge valve connection is the other source of leaks. I never found the copper washers supplied to be effective. I made a lead washer which was better, but ultimately fixed the problem with a neoprene O ring. Did you try annealing the washers? Any time I use a copper washer, I anneal it first. It becomes buttery soft and will seal almost anything.
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Post by solarmike on Nov 22, 2017 0:33:56 GMT
No sir I didn't anneal it I didn't know to do that.. Using a hermetic kit is new to me.. I guess I should consider myself lucky for it to turn out so well the first time I used it..
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Post by timeswelding on Nov 22, 2017 1:18:16 GMT
Simply heat the copper until red and drop in water. It'll be dead soft.
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Post by solarmike on Nov 22, 2017 2:05:43 GMT
Simply heat the copper until red and drop in water. It'll be dead soft. Thanks that's great to know..
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Post by blackhorse on Nov 22, 2017 5:40:56 GMT
I gave up completely on the washers. Like cablehack, I've used an O-ring from the outset.
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Post by solarmike on Nov 22, 2017 14:08:23 GMT
I gave up completely on the washers. Like cablehack, I've used an O-ring from the outset. Yep that makes since but I didn't have any but next time I will for sure...
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