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Old 06-21-2006, 10:31 AM   #1
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1965 17' Caravel
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What's this Gizmo???

Can anyone help me ID this little gizmo next to the drain valve (see black arrow). There is a drain line off it too. Is it a frost plug for freeze protection?

I'm getting materials together for replumbing and would appreciate any input into a replacement part.



Cheers,

Sean
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Old 06-21-2006, 10:41 AM   #2
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I really can't make it out...can you post a bigger picture? forums will allow for a pic up to 1024 pixels...(1024x768 )
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Old 06-21-2006, 10:51 AM   #3
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From what I can see, it looks like it may be a water pressure regulator. A bigger photo would help, though...
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Old 06-21-2006, 11:21 AM   #4
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it's a pressure relief valve for when the water heater comes on and heats up its 6 gallons. The expansion has to go somewhere. If you don't have an accumulator you'll definitely bust something without this little valve. see my last post in "PEX in the Sovereign". You only lose a couple of ounces of water when it opens.

Hey, I didn't know what it was either and threw out two of them in my first two remodeling efforts! But I was lucky in that I installed an accumulator, which saved the day.
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Old 06-21-2006, 11:33 AM   #5
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Thanks!

Makes perfect sense now. I was thinking it was an old school pressure regulator to relieve if there was a spike from the main feed or freezing. Never thought about expansion in a static system!

Is this a part that is readily available? Home Depot or a trailer parts shop?

Sean
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Old 07-01-2006, 12:41 AM   #6
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New water heaters come with a PTRV or is it a TPRV? Anyway, a Pressure - Temperature reliefe valve.
From what Ive seen the same valve is used in residential HW heater as in my Atwood.
You can buy them separatly at any hardware store and can probably tap it into your new pipes.
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Old 07-08-2006, 07:40 AM   #7
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Quote:
Originally Posted by volvophile
New water heaters come with a PTRV or is it a TPRV? Anyway, a Pressure - Temperature reliefe valve.
Yes, but what pressure are they set at? The ones used in the vintage AS plumbing systems say "120 psi unless stamped otherwise" and mine are stamped 65 psi. I think getting the lower pressure valves may require special order. I don't want my systems to ever see anything higher than 100 psi, even though PEX has been shown to hold up to 400 psi.
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Old 07-08-2006, 08:28 AM   #8
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Quote:
Originally Posted by Zeppelinium
Yes, but what pressure are they set at? The ones used in the vintage AS plumbing systems say "120 psi unless stamped otherwise" and mine are stamped 65 psi. I think getting the lower pressure valves may require special order. I don't want my systems to ever see anything higher than 100 psi, even though PEX has been shown to hold up to 400 psi.
Thanks, I think you just saved my water heater. I put a valve on the line that leaves the pressure valve. I guess I'd better keep it open when using the hot water heater. And maybe a life. It's amazing how one can overlook the simpelest things. Or what seem to be simple.That could have been very bad. A new item on my check list.
Thanks Don
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