Reloadron
Contributing Member
Outlaw Man nailed it. Sprinkler systems result in dead heads. Water in those lines gets stagnant. When line pressure changes you don't want that water back flowing into your supply. That is also why I suggested a valve at the end of the line so the system can be easily flushed.Maybe I'm dense (probably!) but I'm having trouble figuring out the purpose of a backflow valve on a fire sprinkler system....
Ron