Febco Reduced Pressure Principle Assembly-1″

The Febco 1″ Reduced Pressure Principle Assembly, model 825Y is used to protect against high hazard (toxic) fluids in water services to industrial plants, hospitals, morgues, mortuaries, and chemical plants. The reduced pressure zone assembly consists of two independently operating, spring loaded, “Y” pattern check valves and one hydraulically dependent differential relief valve. It is used in irrigation systems, boiler feed, water lines and other installations requiring maximum protection. It has an internal relief valve pressure sensing passages, and has simple service procedures. All serviceable parts are in line. The 1″ Backflow Prevention Assy-825Y has low head loss, and replaceable seat rings on all sizes.

In a flow condition the check valves are open with the pressure between the checks, called the zone, being maintained at least 5.0 psi lower than the inlet pressure and the relief valve is maintained closed. Should abnormal conditions arise under no flow or reversal of flow, the differential relief valve will open and discharge to maintain the zone at least 2psi lower than the supply. When normal flow resumes, the zone’s differential pressure will resume and the relief valve will close.

• Approved by the Foundation of Cross-Connection Control and Hydraulic Research at the University of Southern California.
• End connection – NPT ANSI / ASME B1.20.1
• Internal relief valve pressure sensing passages
• Low head loss
• Meets all specifications of AWWA, ASSE, and CSA
• Modular relief valve for ease of maintenance
• Replaceable seat rings on all sizes
• Simple Service procedures. All internal parts serviceable in line
• Spring loaded “Y” type check valves
• Ultimate mechanical protection of potable water, against hazards of
cross-connection contamination

Approvals and Standards
• ANSI/AWWA C511 Conformance
• Approved by the Foundation for Cross-Connection Control and Hydraulic Research at the University of Southern California

• Diaphragms: Nitrile, fabric reinforced
• Elastomers: Nitrile Seat Discs
• Main valve body: Bronze
• Relief valve body: Bronze
• Springs: Stainless Steel

Pressure and Temperature
• Hydrostatic test pressure: 350psi (24.1 bar)
• Maximum working pressure: 175psi (12.1 bar)
• Temperature range: 32ºF to 140ºF (0ºC to 60ºC)

Irrigation Catalog
General Catalog