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Febco #825 3/4" Reduced Pressure Device

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List Price: $479.00
Our Price: $291.92
Item Number: F-825-075
Manufacturer: Febco
Manufacturer Part No: 825-075
FEBCO  Model 825-075 3/4" RPZ

Reduced Pressure Backflow Prevention Device

Series 825Y-QT    RPZ
Quarter Turn Ball Valves

Reduced Pressure Zone Assemblies
Size: 3/4" - 2" (20mm - 50mm)
The FEBCO Series 825Y Reduced Pressure Zone Assemblies are used
to protect against high hazard (toxic) fluids in water services to industrial
plants, hospitals, morgues, mortuaries, and chemical plants. They are also
used in irrigation systems, boiler feed, water lines and other installations
requiring maximum protection.

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

The reduced pressure zone assembly shall consist of two independently
operating, spring loaded, "Y" pattern check valves and one hydraulically
dependent differential relief valve. The assembly shall automatically reduce
the pressure in the "zone" between the check valves to at least 5psi lower
than inlet pressure. Should the differential between the upstream and the
zone of the unit drop to 2psi, the differential relief valve shall open and maintain
the proper differential.
Mainline valve body and caps including relief valve body and cover shall
be bronze. Check valve moving member shall be center stem guided. All
hydraulic sensing passages shall be internally located within the mainline and
relief valve bodies and relief valve cover. Diaphragm to seat area ratio shall
be 10:1 minimum. Relief valve shall have a removable seat ring. Check valve
and relief valve components shall be constructed so they may be serviced
without removing the valve body from the line. All seat discs shall be reversible.
Shutoff valves and test cocks shall be full ported ball valves.
The assembly shall be rated to 175psi (12.1 bar) working pressure and water
temperature range from 32°F to 140°F (0ºC - 60ºC).
The assembly shall meet the requirements of ASSE Standard 1013; AWWA
Standard Code C511; CSA Standard B64.4; and approved by the Foundation
for Cross-Connection Control and Hydraulic Hydraulic Research at the
University of Southern California.

In a flow condition the check valves are open with the pressure between
the checks, called the zone, being maintained at least 5.0psi 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.

Typical Installation
Reduced pressure zone assemblies should be installed with minimum
clearance of 12" (300mm) between relief valve discharge port and floor or
grade. They must be installed where discharge will not be objectionable
and can be positively drained away. They should be installed where easily
accessible for testing and maintenance and must be protected from
freezing. Thermal water expansion and/or water hammer downstream of
the backflow preventer can cause excessive pressure. Excessive pressure
situations should be eliminated to avoid possible damage to the system
and assembly.
Refer to local codes for specific installation requirements. Some codes
may prohibit vertical installation.

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

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

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