Backflow Preventer Valves
Backflow Preventer Valves
(OP)
I have a customer wanting to change the valves on an existing backflow from Butterfly to OS&Y for their sprinkler system. I was always under the understanding that you cannot simply change out the valves but would have to change out the entire assembly, otherwise it would become unlisted. Am I correct in thinking this?





RE: Backflow Preventer Valves
Most of the cut sheets do not show valves attached to the backflow
I would say no problem
RE: Backflow Preventer Valves
But if the valves were changed to a type that was tested as part of another assembly by the backflow manufacturer - that might work.
RE: Backflow Preventer Valves