I have a well. There is a check valve between the well and pressure
tank. This is a tank with air above a bladder or diaphragm that
compresses as the tank fills with water. Is this what you mean by a
cistern tank? Anyway, I have a check valve before that tank that
prevents flow back into the well. Then after the tank there is a
pressure relief valve that will allow water to escape if the pressure
goes over a safe threshold. None of this does any pressure reducing
in routine operation. A control switch turns the pump on when the
tank has 40 pounds of pressure, and off when the tank has 60 pounds
of pressure. Perhaps you have a different type of system?
-Steve Trovato
strovato@optonline.net
At 03:36 PM 3/23/2009, scott.hall@comcast.net wrote:
>we have a well. the exposed above-ground pvc tubing froze and broke
>during the last snap. apparently, the pressure reducing valve froze
>and split as well and it now spraying pretty good.
>
>the question is: do I need to replace it? the well cistern tank
>already has a pressure valve in it, and the pressure in the house is
>too low for my liking anyway.
>
>anybody have a well, and do you have a prv between the tank and the house?
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