LF909 Large
Lead Free* Reduced Pressure Zone Assembly Backflow Preventers with Flood Sensor - Large Diameter 2-1/2 - 10 IN Sizes
LF909 Large
Lead Free* Reduced Pressure Zone Assembly Backflow Preventers with Flood Sensor - Large Diameter 2-1/2 - 10 IN Sizes
Features
- Sensor on the relief valve for flood detection
- Integrates with the Sensor Control Monitor to deliver maintenance alerts to BAS via RS-485 Modbus or the Nexa platform by Wi-Fi connectivity
- ArmorTek coating technology to resist corrosion of internals
- Exclusive relief valve design provides maximum capacity during emergency conditions
- Industrial strength sensing hose on larger size models
- Can be used in a variety of installations, including containment at the service line entrance
- No special tools required for servicing
Nexa pairs integrated sensing hardware with free, upgradable software to empower facilities with unprecedented visibility and control over their water systems, helping teams protect assets, deliver consistent performance, and drive measurable ROI.
Learn more about Nexa
Series LF909 Large Lead Free* Reduced Pressure Zone assemblies feature a flood sensor using SentryPlus Alert® technology to detect continuous discharge from the relief valve. When paired with an add on connection kit, the sensor is activated to relay alerts for potential flooding events. Connection kit options include BMS, cellular communication, and the Sensor Control Monitor which enables integration with BAS via RS-485 Modbus or the Nexa® platform through Wi-Fi.
This series prevents the reverse flow of contaminated water caused by backsiphonage or backpressure from entering the potable water supply. Ideal for protection at health hazard cross-connections or for containment at the service line entrance. Its compact modular design facilitates maintenance and assembly access. Check with local water authorities for installation requirements.
To learn more visit: https://www.watts.com/floodprotectionsystem
The valve’s internals are protected by ArmorTek®, a multilayer corrosion‑resistant coating engineered to extend service life in demanding environments.
To learn more visit: https://www.watts.com/armortek
Approval/Certification Information
For product-specific approval information, please refer to the product’s specification sheet (see literature section above) or ask a Watts representative. Some certification agencies allow you to search by product name and brand.
Literature
Video - ArmorTek Advanced Coating System Overview
Armortek’s patented triple-layer coating protects valves from corrosion and microbiologically induced damage, extending their lifespan and enabling repair and recycling for sustainable water management.
Runtime : 00:01:13Watch Now
Video - Connected Backflow Flood Detection
Learn how Watts flood sensors integrated with backflow prevention assemblies provide real-time alerts for excessive relief valve discharge, helping prevent water damage and facility downtime.
Runtime : 00:01:10Watch Now
Video - LF909-FS with SentryPlus Alert Technology
Product Overview LF909-FS Large
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Video - Flood Protection with SentryPlus Alert Technology
SentryPlus promo video
Runtime : 00:01:33Watch Now
Select a Model
Select options below to identify the UPC, Order Code, and Repair Kit for a specific LF909 Large
No results found
| Model | Used On - Series or Model | Kit Contents |
|---|---|---|
|
FP-BF-BMS 2 1/2-10
Activation Kit |
</br>009, LF009, 909, LF909, 909RPDA, LF919, 957, 957RPDA, LF957RPDA, 994, 994RPDA, C400, C500, LFC500, 4000SS, 5000SS, Deringer 40/40G, Deringer 40X/40GX, Deringer 50/50G, Deringer 50X/50GX</br> |
Sensor Activation Module with Cable, Ground Wire, Power Adapter</br> |
|
FP-BF-CFS 2 1/2-10
Activation Kit |
</br>009, LF009, 909, LF909, 909RPDA, LF919, 957, 957RPDA, LF957RPDA, 994, 994RPDA, C400, C500, LFC500, 4000SS, 5000SS</br> |
Sensor Activation Module with Cable, Cellular Gateway with Mounting Kit, Ground Wire, Power Adapter</br> |
|
FP-BF-SA-009/909 2-3 M2
Upgrade/Repair Kit |
009, 909, 909RPDA</br></br> |
Flood Sensor and 2 Sets of Mounting Bolts</br> |
|
LFRK909-S 3
Seat Kit |
</br>LF909, 909</br> |
Seat, Seat O-ring, Cover O-ring, Retainer Wires, Lubricant</br> |
|
SCM-BF-CONN KIT
Activation Kit |
</br>Watts 009/LF009, LF909, LF919, 909RPDA, 957, 957RPDA, 994, 994RPDA; Ames C400, C500, 5000SS, 4000SS, FEBCO LF860, 825Y, LF825Y, LF866, LF880V, LF886V</br> |
Sensor Control Monitor, Power Adapter, Mounting Feet, and Quick Start Guide</br> |
|
FP-BF-SA-909 4-10 M2
Upgrade/Repair Kit |
909, 909RPDA</br></br> |
Flood Sensor and Mounting Bolts</br> |
|
LFRK 909-CK1 4
First Check Kit |
</br>LF909, 909</br> |
Disc and Spring Assembly, Cover O-ring, Lubricant</br> |
|
LFRK 909-CK2 4
Second Check Kit |
</br>LF909, 909</br> |
Disc and Spring Assembly, Cover O-ring, Lubricant</br> |
|
LFRK 909M1-RV 4-10
Relief Valve Rubber Parts Kit |
</br>909, 909M1</br> |
Sleeve O-ring, Piston O-ring, Stem O-ring, RV Disc Assembly, Diaphragm, Piston Seal, Bottom Plug O-ring, Adapter O-ring, Lubricant</br> |
|
LFRK 909M1-VT 4-10
Total Relief Valve Kit |
</br>909, 909M1</br> |
Diaphragm, Disc and Piston Assembly, Seat, Seat O-ring, Adapter O-ring, Lubricant</br> |
|
LFRK 909-RT 4
Complete Rubber Parts Kit |
</br>LF909, 909</br> |
Check Disc, Cover O-ring, Sleeve O-ring, Piston O-ring, RV Disc Assembly, Diaphragm, Piston Seal, Lubricant</br> |
|
LFRK 909-S 4
Seat Kit |
</br>LF909, 909</br> |
Seat, Seat O-ring, Cover O-ring, Retainer Wires, Lubricant</br> |
|
LFRK 909-CK1 6
First Check Kit |
</br>LF909, 909</br> |
Disc and Spring Assembly, Cover O-ring, Lubricant</br> |
|
LFRK 909-CK2 6
Second Check Kit |
</br>LF909, 909</br> |
Disc and Spring Assembly, Cover O-ring, Lubricant</br> |
|
LFRK 909-RT 6
Complete Rubber Parts Kit |
</br>LF909, 909</br> |
Upper and Lower Check Stem O-ring, Check Disc, Cover O-ring, Sleeve O-ring, Piston O-ring, RV Disc Assembly, Diaphragm, Piston Seal, Lubricant</br> |
|
LFRK 909-S 6
Seat Kit |
</br>LF909</br> |
Seat, Seat O-ring, Cover O-ring, Retainer Wires, Lubricant</br> |
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