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Backflow Preventer Valves

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

I would say you would be correct if the backflow was tested with the valves

Most of the cut sheets do not show valves attached to the backflow

I would say no problem

RE: Backflow Preventer Valves

Most backflows are considered assemblies and tested as such.  Typically that would mean to change the valve would change the assembly - and void the listing/rating.

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

(OP)
Thank you, I appreciate the comments.

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