4 LF909-NRS NYC-FS

Item Number: 88009408
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$23,563.50
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Size: 4 inch
  • Weight: 495.0 lb
  • Body Material: Cast Iron with ArmorTek® Coating
  • Shutoff Valves: NRS Resilient Seated Gate Valves
  • Maximum Working Pressure: 175 PSI
  • Temperature Range: 33°F to 110°F continuous
  • Flood Sensor with SentryPlus Alert® Technology
  • Pre-drilled bolts and discharge restrictor plate included
  • Certifications: ASSE 1013, CSA B64.4, NSF/ANSI 61 & 372, FM, UL

Description

The Watts 4 inch LF909-NRS NYC-FS Reduced Pressure Zone Backflow Preventer Assembly is designed to protect potable water supplies from pollution caused by backsiphonage or backpressure. Featuring a durable epoxy-coated cast iron body and NRS gate valves, this assembly ensures reliable performance. It includes a SentryPlus Alert® flood sensor to detect excessive relief valve discharge and is compatible with various remote monitoring systems. The NYC version comes with pre-drilled bolts and a discharge restrictor plate. With a maximum working pressure of 175 PSI and ASSE 1013, CSA B64.4, and NSF certifications, it provides robust and compliant backflow prevention. Item number 88009408.

Help Me Connect

Flood Sensor Connectivity

This backflow preventer includes a flood sensor with SentryPlus Alert® technology. To activate extended monitoring and remote alerts, the sensor requires an add-on connection kit. Compatible kits include options for Building Management Systems (BMS), cellular communication, or integration with the Sensor Control Monitor for communication via RS-485 Modbus or the Nexa® platform through Wi-Fi. A proper drainage system for the relief valve discharge is essential for installation.

Installation Notes

The NYC version of this assembly features pre-drilled bolts, eliminating the need for flange drilling during installation.

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Additional Details

The Watts 4 inch LF909 Reduced Pressure Zone (RPZ) Backflow Preventer Assembly is engineered to prevent the reverse flow of polluted water from entering a potable water supply system due to backsiphonage or backpressure. This NYC-specific version includes pre-drilled bolts and a discharge restrictor plate.

Construction & Features

  • Features an epoxy coated cast iron body for durability and corrosion resistance.
  • Equipped with NRS (Non-rising stem) gate valves for reliable shutoff.
  • Includes captured spring check valves, replaceable seats, and top-mounted test cocks for ease of maintenance.
  • A field-reversible pressure differential relief valve ensures proper function.
  • The advanced ArmorTek® 3-part epoxy coating system is designed to limit microbial induced (MIC) and exposed metal substrate corrosion on internal and external surfaces.
  • Comes with a flood sensor with SentryPlus Alert® technology to detect excessive water discharge from the relief valve.
  • The sensor is compatible with add-on connection kits for extended monitoring and alerts via BMS, cellular communication, or the Nexa® platform via Wi-Fi.
  • The NYC version includes four sets of 304SS bolts/nuts with a 1/4 inch hole drilled axially through the bolts and a restrictor plate to limit discharge.

Specifications

General

  • Nominal Size: 4 inch
  • Body Material: Cast Iron
  • Coating: ArmorTek® 3-part Advanced Epoxy (internal and external surfaces)
  • Shutoff Valves: Non-rising Stem (NRS) Resilient Seated Gate Valves
  • Seat Material: Stainless Steel
  • Trim Material: Stainless Steel
  • Check Valve Body: Cast Iron
  • Relief Valve Body: Cast Iron
  • Test Cocks: Lead Free* copper silicon alloy

Performance

  • Maximum Working Pressure: 175 PSI (12.06 bar)
  • Temperature Range (Continuous): 33°F to 110°F (0.5°C to 43°C)
  • Temperature Range (Intermittent): 140°F (60°C)

Certificates & Approvals

  • AWWA C511-92
  • IAPMO PS 31
  • SBCCI (Standard Plumbing Code)
  • USC Manual for Cross-Connection Control, 8th Edition
  • NSF/ANSI 61
  • NSF/ANSI 372
  • FM Approved
  • UL Classified/FM Approved
  • ASSE 1013
  • CSA B64.4

FAQs

What is the primary function of the Watts 4 inch LF909 Reduced Pressure Zone Backflow Preventer?

The primary function is to prevent the reverse flow of polluted water from re-entering the potable drinking water supply system. This protects against contamination caused by backsiphonage or backpressure events.

What is ArmorTek® coating and why is it important?

ArmorTek® is a patented 3-part advanced epoxy coating system applied to both internal and external surfaces of the cast iron body. It is designed to resist microbial induced (MIC) corrosion and protect exposed metal substrates, enhancing the longevity and durability of the assembly.

Does this backflow preventer include a flood sensor, and how does it work?

Yes, it includes a flood sensor with SentryPlus Alert® technology. This 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 Wi-Fi.

What makes this a 'NYC version' of the backflow preventer?

The NYC version includes four sets of 304SS bolts/nuts that have a 1/4 inch hole drilled axially through them, along with a discharge restrictor plate. These features are specific requirements for installations in New York City.

What are the maximum operating pressure and temperature ratings for this assembly?

The assembly has a maximum working pressure of 175 PSI (12.06 bar). It can operate continuously in temperatures ranging from 33°F to 110°F (0.5°C to 43°C), with intermittent operation up to 140°F (60°C).

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