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Brand - Watts
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Size: 3/4 inch
Lead Free* Construction
Maximum Working Pressure: 175 psi
Continuous Temperature Range: 33°F - 140°F
Flood Sensor with SentryPlus Alert® Technology
Patented Air-in/Water-out Relief Valve Design
Horizontal or Vertical Installation
NPT Female Threaded Connections
Description
The 3/4 inch Watts LF909-QT-FS Lead Free Reduced Pressure Zone Backflow Preventer Assembly provides critical protection for potable water supplies. It prevents hazardous materials from entering the drinking water system due to backsiphonage or backpressure. Featuring Lead Free* cast copper silicon alloy construction, this compact unit includes a flood sensor with SentryPlus Alert® technology for discharge detection and Watts' patented air-in/water-out relief valve design for high capacity discharge during emergencies. It supports both horizontal and vertical installation and has a maximum working pressure of 175 psi. Item number F391008.
Help Me Connect
Connecting Your Watts LF909-QT-FS
This 3/4 inch backflow preventer assembly features NPT Female threaded body connections on both the inlet and outlet.
It is designed to connect to 3/4 inch NPT Male threaded pipes in your potable water supply system.
Installation can be done either horizontally or vertically (up or down) on 3/4 inch and 1 inch sizes.
This 3/4 inch Watts LF909-QT-FS Lead Free Reduced Pressure Zone Backflow Preventer Assembly provides superior cross-connection control, preventing polluted water from entering the potable water supply due to backsiphonage and backpressure.
Ideal for continuous pressure piping applications and protecting against health hazards and other contaminants.
Design & Functionality
Features Watts' exclusive patented "air-in/water-out" principle for high capacity relief valve discharge during emergency conditions.
Designed for modular, compact installation, allowing for easy placement.
Can be installed horizontally or vertically (up or down) without special tools.
Equipped with quarter-turn ball valve shutoffs featuring tee handles for easy operation.
Includes replaceable seats for simplified maintenance.
Flood Detection
A built-in flood sensor with SentryPlus Alert® technology detects continuous water discharge from the relief valve.
When paired with an optional add-on sensor connection kit, the sensor activates to relay alerts for potential flooding events.
Connection kit options include BMS, cellular communication, and the Sensor Control Monitor for integration with Building Automation Systems (BAS) via RS-485 Modbus or the Nexa® platform through Wi-Fi.
Installation requires thoroughly reading all instructions and product safety information. Inquire with governing authorities for local installation requirements. A drain line with an air gap is recommended for proper discharge.
Specifications
Body Material: Lead Free* cast copper silicon alloy
Check Seats: 909 Celcon®
Relief Valve Seats: Stainless Steel 909
Test Tocks: Lead Free* cast copper silicon alloy
Performance
Maximum Working Pressure: 175 psi (12.1 bar)
Temperature Range (Continuous): 33°F - 140°F (0.5°C ~ 60°C)
Temperature Range (Intermittent): 180°F (82°C)
Connections
Connection Size: 3/4 inch
Connection Type: NPT Female threaded body connection
Certificates & Approvals
ASSE 1013
AWWA C-511-92
CSA B64.4
FCCCHR of USC Manual Section 10
IAPMO (UPC) Listed
SBCCI (Standard Plumbing code) Listed
NSF International Tested and Certified (NSF/ANSI 61-G&372)
Approved by Foundation for Cross-Connection Control and Hydraulic Research at the University of Southern California
FAQs
What is the primary function of the Watts LF909-QT-FS backflow preventer?
Its primary function is to protect the potable water supply from contamination by preventing the backflow of hazardous materials due to backsiphonage or backpressure.
Is this backflow preventer suitable for both horizontal and vertical installations?
Yes, for 3/4 inch and 1 inch sizes, this assembly can be installed either horizontally or vertically (up or down), offering installation flexibility.
What does the "Lead Free*" designation mean for this product?
"Lead Free*" means that the wetted surface of this product that contacts consumable water contains less than 0.25% lead by weight, complying with lead-free installation requirements.
How does the flood sensor feature work on this assembly?
The flood sensor with SentryPlus Alert® technology detects continuous water discharge from the relief valve. When an add-on connection kit is used, it activates to relay alerts for potential flooding, which can be communicated via BMS, cellular, or Wi-Fi.
What type of connections does the 3/4 inch LF909-QT-FS have?
The 3/4 inch LF909-QT-FS backflow preventer features 3/4 inch 909-NPT Female threaded body connections for both the inlet and outlet.
