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Backflow Reference Manual - Ames


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4000SS

Sizes

3/4", 1", 1 1/4", 1 1/2", 2", 2 1/2", 3", 4", 6", 8", 10"

Description

This is a reduced pressure assembly. Production began in 1990. Production was discontinued on the 3/4"-2" size in 1997. The body is constructed of fabricated stainless steel and utilizes a single top bolted entry access to the checks. The relief valve is mounted under the check body and has an external relief valve sensing line. The relief valve can be removed from the check body. On the 3/4"-2" size assembly there have been several versions of the relief valve utilized over the years. To be sure which version you have the serial number may be needed to order the correct repair parts. The checks are a cam operated design which is made of glass filled noryl. All versions have a modular check design so the springs will be contained and the seats will be replaceable. From 1990-1992 the 3/4"-2" size utilized an internal ball valve shut off design where the ball valve is built into the body of the assembly. From 1992 an external ball valve was externally screwed onto the body of the assembly. The 2 1/2" and 3" end to end body dimension could vary by 5/8" due to a manufacturing design change of the end flanges. Repair parts will be the same for both versions. The check mechanism on the 2 1/2"-12" is made of glass filled noryl. The checks are modular in construction so that springs will be contained and seats are replaceable. The check design is a cam operated mechanism. In the 2 1/2"-6" sizes the check modules are not field repairable and the whole check module must be replaced for a proper repair. The 8" and 10" check does have a rubber disc that is field replaceable. The relief is mounted under the check body and mounted by an external relief valve sensing line..

Details

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.