Is a Pressure Relief Valve Needed for Well Pump ?

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Old 02-27-11, 12:39 PM
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Is a Pressure Relief Valve Needed for Well Pump ?

The owners manual for my well pump has the following note...

"Submersible pumps can develop very high pressure in some situations. To prevent tank blowup, install a pressure relief valve able to pass full pump flow at 100 PSI when using a pre-charged pressure tank."

The contractor who plumbed my house when it was built 23 years ago never installed one so I called him the other day when I discovered this recommendation. He said he rarely installs them unless the owner asks for it.

I didn't think to ask him but, would the pressure relief valve at the water heater serve the same purpose (of course, assuming there are no valves closed between the pressure tank and water heater) ?

If answer to above is negative, is it critical to have a relief valve as suggested?
 
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Old 02-27-11, 02:25 PM
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I doubt very seriously you would ever achieve near critical pressure from a well pump. However, for a warm and fuzzy, yes, installing a PRV ahead of the water heater, since it is first in line, would suffice.
 
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Old 02-27-11, 08:47 PM
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YES you should have one. Anything can happen, freeze, pressure switch stick. It may not harm the water heater, but it can bust pipes and or some fittings, and create a very big mess.
The best place to have one, is at the well head itself.
 
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Old 03-01-11, 05:20 AM
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Sorry, I was thinking PRV rather than a relief valve. YES, definitely have a relief valve at the head. The pressure regulating valve, as used on municipal water would not be needed. Hope it wasn't confusing.
 
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