Welcome! Here are the website rules, as well as some tips for using this forum.
PRV placement on closed heat exchanger circuit?
For my new heating system I have my heating zones on a closed circuit drawing heat from coil heat exchangers in my buffer tank. Been trying to determine the best location for the PRV. I was thinking right at the begining of the supply from the HXs? or tee'd off from the expansion tank line between the Air separator and expansion tank? Also between those two will be my make up water with feed valve.