Febco model 825 is a reduced pressure backflow assembly. The model 825 was produced from approximately 1975 to 1988. The 1 1/2″ and 2″ sizes were discontinued in 1978 and the body was made of bronze. The 2 1/2″-10″ check valve body was made of cast iron construction with a painted epoxy coating to inhibit rust. The first few years this valve was produced with some internal parts constructed out of aluminum causing premature and serious erosion. These parts were redesigned to avoid this problem. The check valves use the 805Y design of construction. The 2 1/2″-3″ have an uncontained check spring. The 4″-10″ have a contained check spring. Some versions of the contained spring check assembly required the spring tension to be released to change the rubber check discs. A spring removal tool is suggested to release the spring tension. Check seats were replaceable and a seat removal tool was needed to replace the seats. The 825D series was built from 1988-1989. The check valve utilizes the 805YD design of construction. The 2 1/2″-3″ have uncontained check springs. The 4″-10″ have a contained check spring design. The changes were that the body was made of ductile iron instead of cast iron and internal check parts are stainless steel instead of epoxy painted iron or bronze. The check bodies on 2 1/2″-10″ were painted epoxy coated. In 1991 it was changed to a fused epoxy coating. The check seats are bronze and replaceable. In the 825D the check seats are bolted in and a special tool is not needed to replace the seat. The relief valve on both models was the same; it is a side mounted relief valve assembly that attaches by a special bushing to the body and can be removed from the check body. The relief valve utilizes an external relief valve sensing line. Most repair parts are the same for the 825 and the 825D models.
- The DuraCheck features all stainless steel check assemblies for corrosion resistance, reduced fouling and longer valve life.
- DuraCast® ductile body for superior strength, corrosion resistance and lighter weight.
- Ultimate mechanical protection of potable water against hazards of cross connection contamination.
- Double diaphragm differential relief valve.
1 1/2″,2″, 2 1/2″, 3″, 4″, 6″, 8″, 10″