Backflow Reference Manual - Ames

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4000 RP


4", 6", 8", 10"


The Ames 4000 is a reduced pressure assembly. Production began approximately in 1986. The 4" and 6" were discontinued in 1995. The 8" and 10" were discontinued in 2005. The bodies are a welded fabricated steel which is fused epoxy coated. The internal hardware parts are stainless steel with the check seats constructed of bronze. Special tools are suggested for proper repair of the check assemblies. The first check uses the tower mount design of check mechanism which requires the tong tool for proper repair. The second check uses the side mount check mechanism which requires the retainer clip tool for proper repair. The check springs are contained when the covers are removed but must be released for a proper repair. Check seats are replaceable and a seat removal tool is needed to change them. The check mechanism utilizes a pivot action knuckle joint design. The check utilizes a vulcanized clapper plate instead of a rubber disc. The relief valve spring is not contained when the relief valve cover is removed. The relief valve body is removable from the check body and utilizes an external sensing line. The relief valve seat is replaceable.


Common repair parts are a very small subset of the 10,000 plus items BAVCO stocks. Please feel free to contact us direct at 800-458-3492 for pricing on items not listed or backflow prevention devices.