4 inch Reduced Pressure Detector Backflow Preventer
Weight: 266.0 lb
Lead Free construction (less than 0.25% lead by weight)
Type 304 (Schedule 40) stainless steel housing and sleeve
Z pattern horizontal installation approved
Includes OSY resilient seated gate valves
Integrated flood sensor with SentryPlus Alert® technology
Cubic feet per minute (CFM) bypass meter
Maximum Working Pressure: 175 psi
Description
This 4 inch Colt Lead Free Reduced Pressure Detector Backflow Preventer Assembly provides critical protection for potable water systems in fire protection applications. It prevents contamination from backsiphonage and backpressure, ensuring water quality. Featuring a compact modular design, it is approved for horizontal Z pattern installation. The assembly includes a Type 304 stainless steel body, OSY shutoff valves, and a metered bypass for leak detection. An integrated flood sensor with SentryPlus Alert® technology detects excessive relief valve discharge, enhancing system monitoring. It is designed for a maximum working pressure of 175 psi. Item F0124655.
Help Me Connect
Flood Sensor Activation
An add-on sensor connection kit is required to activate the integrated flood sensor and enable communication.
Without the connection kit, the flood sensor functions as a passive component and will not communicate with any other device.
Connection kit options include BMS, cellular communication, or the Sensor Control Monitor, which integrates with Building Automation Systems (BAS) via RS‑485 Modbus or the Nexa® platform through Wi-Fi.
The Colt™ 4 inch lead free reduced pressure detector backflow preventer assembly is designed to prevent the reverse flow of fire protection substances and water of non-potable quality from being pumped or siphoned into the potable water supply due to backsiphonage and or backpressure. This compact modular assembly is approved for horizontal Z pattern installation and includes an integrated flood sensor to detect excessive water discharges.
Features
Lead Free construction to comply with Lead Free installation requirements; the wetted surface of this product contacted by consumable water contains less than 0.25% of lead by weight.
Extremely compact modular design and 70% lighter than traditional designs.
Housing and sleeve constructed from Type 304 (Schedule 40) stainless steel.
Includes OSY (Outside Stem and Yoke) resilient seated gate valves and corrosive resistant bottom mounted pressure relief valve.
Patented link check for lowest pressure loss.
Metered bypass (cubic feet per minute) to detect leakage or theft of water from the fire sprinkler system.
Integrated flood sensor with SentryPlus Alert® technology on the relief valve for flood detection.
An add-on sensor connection kit is required to activate the flood sensor. Without the connection kit, the flood sensor is a passive component and will not communicate with any other device.
Specifications
General
Product Type: Reduced Pressure Detector Assembly
Size: 4 inch
Configuration: Z pattern horizontal
Lead Content: Less than 0.25% by weight (wetted surface)
Materials
Housing & Sleeve Material: Type 304 (Schedule 40) stainless steel
Flood Detection: Sensor on Relief Valve (FS option)
Certificates & Approvals
Approved by the Foundation for Cross-Connection Control and Hydraulic Research at The University of Southern California (FCCCHR-USC)
AWWA C511-97
ASSE 1047
CSA B64.4
cULus Classified (OSY Only)
FM Approved (OSY Only)
NSF Certified to NSF/ANSI 372
FAQs
What is the primary function of the 4 inch LFC500Z-OSY-C-FS assembly?
This assembly is a reduced pressure detector backflow preventer designed to protect potable water systems from contamination due to backsiphonage and backpressure, particularly in fire protection systems.
What materials are used for the main body and sleeve of this backflow preventer?
The valve body and closure sleeve are manufactured from Type 304 (Schedule 40) stainless steel, offering durability and corrosion resistance.
How does the integrated flood sensor work with SentryPlus Alert® technology?
The flood sensor detects excessive water discharges from the relief valve. When paired with an add-on connection kit, it can relay alerts for potential flooding events via BMS, cellular, or the Sensor Control Monitor.
What is the maximum operating pressure and temperature range for this unit?
This backflow preventer has a maximum working pressure of 175 psi (12.1 bar) and operates within a temperature range of 33°F to 110°F (0.5°C to 43°C).
Is this backflow preventer approved for specific installation patterns?
Yes, this compact modular design is specifically approved for horizontal Z pattern installation, as indicated by the "Z" in its model number.
