Body Material: Lead Free* Cast Copper Silicon Alloy
Connection Type: NPT Male Threaded
Features Flood Sensor with SentryPlus Alert® Technology
Patented Air-In/Water-Out Design for Emergency Conditions
Description
This Watts 1 1/4 inch LF909M1-QT-S-FS Lead Free Reduced Pressure Zone Backflow Preventer Assembly provides crucial protection for potable water supplies. It prevents contaminated water from entering the drinking water system due to backsiphonage and backpressure, making it suitable for health hazard cross-connections. Featuring a patented air-in/water-out design for high relief valve discharge during emergencies, this assembly also includes a flood sensor with SentryPlus Alert® technology to detect excessive water discharge. Constructed from lead-free cast copper silicon alloy with quarter-turn ball valve shutoffs, it offers a maximum working pressure of 175 psi and operates in temperatures from 33°F to 140°F.
Help Me Connect
This 1 1/4 inch backflow preventer assembly features NPT Male threaded connections, designed to connect directly to 1 1/4 inch NPT Female threaded piping in your system.
Drain Line:
A drain line is recommended for the relief valve discharge.
Ensure an air gap is maintained when installing the drain line for proper function and compliance.
This 1 1/4 inch Lead Free Reduced Pressure Zone Backflow Preventer Assembly provides superior cross-connection control for potable water supplies, protecting against backsiphonage and backpressure of hazardous materials. It is designed for continuous pressure piping applications and health hazard cross-connections, utilizing a patented air-in/water-out principle for maximum relief valve discharge during emergency conditions.
Key Features
Lead Free* construction to comply with national requirements, ensuring less than 0.25% lead content by wetted surface weight.
Patented air-in/water-out design provides high capacity relief valve discharge, even with fouled check valves and simultaneous backsiphonage/backpressure.
Modular, compact design allows for easier installation and maintenance.
Replaceable seats for simplified servicing without special tools.
Can be installed in either a horizontal or vertical (up or down) orientation.
Flood sensor with SentryPlus Alert® technology on the relief valve detects excessive water discharges.
Flood alerts can be activated with an add-on sensor connection kit, compatible with BMS and cellular communication for remote monitoring.
Assembly Components
Lead Free* body made of cast copper silicon alloy.
Quarter-turn ball valve shutoffs with lever handles, also made of Lead Free* cast copper silicon alloy.
Check modules for effective backflow prevention.
Top mounted test cocks, constructed from Lead Free* cast copper silicon alloy.
Bronze strainer installed upstream of the No. 1 shutoff valve to protect components.
Pressure differential relief valve for emergency discharge.
An add-on 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 other devices. The flood sensor does not replicate the need for proper drainage or compliance with installation codes and regulations. Watts is not responsible for alert failures due to connectivity or power issues.
Specifications
Nominal Pipe Size: 1 1/4 inch
Connection Type: NPT Male Threaded
Performance
Maximum Working Pressure: 175 psi (12.1 bar)
Continuous Temperature Range: 33°F - 140°F (0.5°C - 60°C)
Intermittent Temperature Range: 180°F (82°C)
Materials
Body Material: Lead Free* Cast Copper Silicon Alloy
Check Seats: 909 Celcon®
Relief Valve Seats: Stainless Steel 909
Test Cocks: Lead Free* Cast Copper Silicon Alloy
Shutoff Valves: Lead Free* Cast Copper Silicon Alloy
Strainer Material: Bronze
Certificates & Approvals
AWWA C-511-92
FCCCHR of USC Manual Section 10
IAPMO (UPC)
SBCCI (Standard Plumbing code)
Tested and Certified by NSF International (NSF/ANSI 61-G & 372)
ASSE 1013
CSA B64.4
Listed by IAPMO
Listed by SBCCI
Approved by Foundation for Cross-Connection Control and Hydraulic Research at USC
FAQs
What is the primary function of the Watts LF909M1 backflow preventer assembly?
The primary function is to provide superior cross-connection control, protecting potable water supplies from contamination due to backsiphonage and backpressure of hazardous materials.
What does "Lead Free*" construction mean for this product?
The "Lead Free*" construction indicates that the wetted surface of the product, which contacts consumable water, contains less than 0.25% lead by weight, meeting national lead-free installation requirements.
How does the flood sensor feature work on this assembly?
The flood sensor with SentryPlus Alert® technology detects excessive water discharges from the relief valve. To activate flood alerts for notification, an add-on sensor connection kit is required, as the sensor is passive without it.
Can this backflow preventer be installed horizontally or vertically?
Yes, this assembly features a modular, compact design that allows for installation in either horizontal or vertical (up or down) orientations.
What are the connection types and size for this specific assembly?
This 1 1/4 inch assembly features NPT Male threaded body connections, designed for plumbing systems with corresponding 1 1/4 inch NPT Female connections.
