1 LF850-QT-FZ DC
Item Number: T683040Brand - Febco
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- Size: 1 inch
- Body Material: Lead Free Cast Copper Silicon Alloy
- Maximum Working Pressure: 175 PSI
- Temperature Range: 32°F to 140°F
- Features an integrated freeze sensor
- Compact modular design for easy maintenance
- Includes top-mounted test cocks
- Protects potable water from pollution
Description
Description
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Connections
- The assembly features 1 inch Female NPT (National Pipe Taper) end connections conforming to ANSI/ASME B1.20.1 standards for threaded pipe connections.
Freeze Sensor Connectivity
The integrated freeze sensor works with SentryPlus Alert® technology. To activate a monitoring system that provides alerts for low and freezing temperatures, an add-on connection kit (sold separately) is required. This kit enables communication via Wi-Fi networks, building management systems (BMS), or irrigation management systems (IMS) using a switched output relay.

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Additional Details
This 1 inch Lead Free Double Check Valve Backflow Preventer Assembly is designed for non-health hazard applications, protecting the potable water supply from polluted water due to backsiphonage or backpressure. It features a compact modular design for easy in-line maintenance with a single access cover.
The assembly includes a freeze sensor with SentryPlus Alert® technology to monitor temperature and alert facility personnel when freeze conditions could cause equipment damage.
Features
- Lead Free cast copper silicon alloy body construction to comply with lead-free installation requirements
- Includes a freeze sensor to monitor temperature and provide alerts for low and freezing conditions
- Compact modular design facilitates easy in-line maintenance with a single access cover
- Two in-line independent positive seating check modules
- Replaceable seats and seat discs
- Top-mounted test cocks for easy testing
- NPT end connections (ANSI/ASME B1.20.1)
- Quarter-turn ball valve shutoffs for reliable operation
- Available freeze sensor connection kit to activate a monitoring system that triggers alerts for low and freezing temperatures via Wi-Fi, BMS, or irrigation management systems
WARNING: The freeze sensor provides alerts about a possible freeze event but cannot prevent it from occurring. User action is required to prevent freeze conditions from causing product and/or property damage. An add-on connection kit (sold separately) is required to activate the freeze sensor; without it, the sensor is a passive component and does not communicate with any other device.
Specifications
General
- Product Type: Double Check Valve Assembly
- Valve Body Material: Lead Free Cast Copper Silicon Alloy
- Elastomers: Silicone
- Springs: Stainless Steel
- Inlet/Outlet Connections: 1 inch Female NPT
- Shutoff Type: Quarter Turn Ball Valve
- Check Modules: Two in-line independent, positive seating
- Test Cocks: Top-mounted
- Freeze Sensor: Included, SentryPlus Alert® technology
Performance
- Maximum Working Pressure: 175 PSI (12.1 bar)
- Hydrostatic Test Pressure: 350 PSI (24.1 bar)
- Temperature Range: 32°F to 140°F (0°C to 60°C)
Certificates & Approvals
- ASSE 1015
- CSA B64.5
- NSF/ANSI 61-G
- UPC
- USC-FCCCHR
- ANSI/AWWA C510-92