902472 - 1st Check Assembly

The 2 1/2 - 10" Febco 825 Series reduced pressure zone assemblies began production in 1975 and is still currently in production. The 825 body is constructed of epoxy coated cast iron. The 825 (1975-88) model 2 1/2 - 3" featured bronze check assemblies and the 4 - 10" where epoxy coated cast iron. 2 1/2 - 3" checks do not have contained springs while the 4 - 10" check designs are self contained and require a spring compression tool to change springs. No special tools needed to replace rubbers. Very early models contained aluminum check assemblies which were prone to erosion damage. The check seats were removable on the 825 although a special seat removal tool was needed. In 1988 the 825D was introduced. The body was changed to a ductile iron, painted epoxy coating. Check assemblies where changes to stainless steel construction. The newer stainless steel checks are interchangable with the older cast iron or bronze check assemblies. The seats were redesigned so no special tools are required for servicing. The 825D was replaced by the 825YD in 1989 and is the current model available. The body remained painted epoxy ductile iron like the 825D. In 1991, fusion epoxy coating replaced the painted epoxy coating. The 825YD relief valve was changed from the older 825/825D. Relief valve parts are not interchangable between the original styla and later 825YD style. Older devices can be upgraded to the new YD style with a "RETRO" kit. Both relief valve styles utilize an external sensing line hose. The check covers were also redesigned and in turn the cover O-rings are different. All rubber repair kits include both old and new style cover O-rings. Check disc rubbers remained the same through all the years of changes.