Method to Replace A Fire Backflow Preventer?

12/11/2018

When a backflow preventer needs to be replaced, can the two isolation valves remain in place, closed, and only the center body of the backflow be inserted in-between these isolation valves?

Would this violate the listing on the assembly if it's a one-for-one replacement?

If the backflow is listed as an entire assembly, then it seems as though an additional isolation valve on the supply-side of the backflow preventer would often be needed to shut off the system just in order to replace the backflow preventer.

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2 Comments

Wayne Ammons

12/11/2018 08:28:34 am

Most backflows are listed as an assembly. If a non-certified person was to do work on or replace just the check portion of the assembly as you describe, you could very well void the listing.
Technicians with my company that do work on backflow assemblies are all certified to do so.

Not knowing your specific situation, typically there is a valve between the backflow assembly and the connection to the city supply left when the wet tap was made.

William Shores

12/11/2018 10:56:31 am

The backflow manufacturer will sell a replacement kit with thier specific instuctions. My experience is a certified technician can replace the backflow with out replacing the valves.

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Method to Replace A Fire Backflow Preventer?

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