What you call redundant is a "master valve" that feeds a system mainline - and provides protection from a stuck-open zone valve
Thank you sir. The placement of a master valve for protection makes sense now. What doesn't is how can the Irritrol's manual bleed seemingly push water backwards through the BFP?
I'll illustrate my assumed flow from the City to said "master valve"
City Feed===>Meter==>BFP==>Irritrol "master valve"==>my system's mainline, etc.
How can the Irritrol 2400 bleed knob dump through the upstream BFP if water should only travel to the right in my flow diagram?
Thanks again.