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Old 06-06-2015, 08:29 AM   #1
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Pressure relieve valve

What position do I put the pressure relieve valve when filling up the camper with water? I assume closed? And how about when I light the water heater pilot and turn on the water heater? Should it be open first and then closed?
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Old 06-06-2015, 10:12 AM   #2
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If your talking about the pressure relief on the tank, you do nothing with it. It only opens when the tank overheats and pressure raises.
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Old 06-06-2015, 10:14 AM   #3
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Pressure relief valve on w/h are there to pop open in case the w/h overheats. Its also a easy way to break the vacuum while draining the tank. All other times it should be closed, for water will exit thru it while filling.
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Old 06-06-2015, 10:34 AM   #4
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The relief valve can be opened when your filling up with water to purge the air out when water flows out close it. This is what I do, makes for less spitting at the faucets the first time.
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Old 06-06-2015, 10:58 AM   #5
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The relief valve should normally be closed, but should be opened now and again to make sure it operates freely, if needed. I use the relief a few times each year to drain the water heater, if the camper sits for more than two weeks. (The water can get pretty skunky just sitting in it!) Using it for draining also exercises it, so it's a win-win.
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Old 06-06-2015, 11:30 AM   #6
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Never open it when it's hot 140deg. You'll get almost scalded. If your in the process of draining the hot water heater and you have the drain plug OFF then you can open it.
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Old 06-06-2015, 02:04 PM   #7
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Quote:
Originally Posted by rabalin View Post
The relief valve can be opened when your filling up with water to purge the air out when water flows out close it. This is what I do, makes for less spitting at the faucets the first time.
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Old 06-06-2015, 03:46 PM   #8
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Quote:
Originally Posted by rabalin View Post
The relief valve can be opened when your filling up with water to purge the air out when water flows out close it. This is what I do, makes for less spitting at the faucets the first time.
That is a great idea! I will try it when I fill up this week.
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Old 06-08-2015, 03:06 PM   #9
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Great tip

Thanks
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Old 07-08-2015, 03:28 PM   #10
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I'd like to get a clarification on these posts re: pressure relief valve. I drain our Jayco travel trailer's water heater before breaking camp. However, the w/h plastic drain plug becomes a missile when I unscrew it even after unhooking the municipal water source, opening the low point drain and opening faucets inside the trailer. I interpret the postings here to suggest using the valve to ease the pressure before unscrewing the plug ("it's an easy way to break the vacuum while draining the tank"). But another posting seems to say the plug comes out first, then the valve can be opened ("If you're ... draining the water heater and you have the drain plug OFF, then you can open it"). Can somebody explain a proper procedure to drain the w/h without the drain plug becoming a weapon? Thanks much. John K, dedlnr@aol.com
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