Closed plumbing systems & expansion tanks

[Amalia Markous]

We have a subdivision that has excessive water pressure so we require a pressure reducing valve. Now this doesn't make a closed system but since the pressure is higher on the incoming side than the outgoing we require an expansion tank.

Our thought on this is even though the PRV will allow water to backflow into the city system when the water expands it will not because the pressure is higher on the city side. The water has to expand somewhere so...expansion tank.

The reason I post this is because this type of system is not a closed system but in my opinion the circumstances create a situation where a expansion tank is needed.

Thanks a lot.
Amalia Markous

[Jeffrey R. Jonas]

Originally Posted by Amalia Markous

We have a subdivision that has excessive water pressure so we require a pressure reducing valve. Now this doesn't make a closed system but since the pressure is higher on the incoming side than the outgoing we require an expansion tank.

Our thought on this is even though the PRV will allow water to backflow into the city system when the water expands it will not because the pressure is higher on the city side. The water has to expand somewhere so...expansion tank.

The reason I post this is because this type of system is not a closed system but in my opinion the circumstances create a situation where a expansion tank is needed.

Thanks a lot.
Amalia Markous

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