6 LF909-OSY NYC-FS

Item Number: 88009410
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$36,517.50
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When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Nominal Pipe Size: 6 inch
  • Weight: 830.0 lb
  • Product Type: Reduced Pressure Zone Backflow Preventer
  • Shutoff Valves: OSY (Outside Stem & Yoke)
  • Body Material: Cast Iron with ArmorTek® Coating
  • Maximum Working Pressure: 175 psi
  • Flood sensor with SentryPlus Alert® technology
  • NYC version with pre-drilled bolts and discharge restrictor plate
  • Approved by ASSE 1013, FM, UL, NSF, and CSA B64.4

Description

The 6 inch Lead Free Reduced Pressure Zone Backflow Preventer Assembly with OSY shutoff valves prevents backflow of polluted water into potable water supplies. Constructed with an ArmorTek® coated cast iron body and stainless steel internals, it offers superior corrosion resistance. This NYC-specific model includes pre-drilled 304 stainless steel bolts and a discharge restrictor plate, meeting local requirements. A built-in flood sensor with SentryPlus Alert® technology detects excessive relief valve discharge, with options for integration into building management systems. It is rated for 175 psi maximum working pressure and approved by ASSE 1013, FM, UL, NSF, and CSA B64.4. Item number 88009410.

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Installation Guidance

This Reduced Pressure Zone (RPZ) backflow preventer assembly is designed for installation at each cross-connection to prevent backflow into the potable water supply. The unit can be furnished with two OSY or two NRS shutoffs, with this specific model featuring OSY valves. When installing a drain line for the relief valve, it is recommended to ensure an adequate air gap is maintained between the relief valve discharge and the drain line to prevent backflow conditions. The included flood sensor with SentryPlus Alert® technology is designed to detect continuous discharge from the relief valve; it can be integrated with add-on connection kits for BMS, cellular communication, or the Sensor Control Monitor for wider system integration.

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Additional Details

This 6 inch Lead Free Reduced Pressure Zone Backflow Preventer Assembly with OSY (Outside Stem & Yoke) shutoff valves is designed to prevent the reverse flow of polluted water from entering into the potable water supply due to backsiphonage or backpressure.

This assembly is specifically designed for NYC installations, featuring pre-drilled bolts and a discharge restrictor plate. It also incorporates a flood sensor with SentryPlus Alert® technology to detect continuous discharge from the relief valve, providing enhanced monitoring capabilities.

Features

  • Lead Free construction ensures compliance with reduced lead content requirements.
  • ArmorTek® coating technology on iron components resists electrochemical and microbial-induced corrosion internally and externally.
  • Features a flood sensor with SentryPlus Alert® technology to detect continuous discharge from the relief valve.
  • Includes an add-on sensor connection kit for extended flood monitoring (compatible with BMS, cellular, or Sensor Control Monitor for BAS integration via RS-485 Modbus or Nexa® Wi-Fi platform).
  • Replaceable seats and stainless steel internal parts for durability and easy maintenance.
  • Captured spring check assemblies and fused epoxy coated and lined checks.
  • Field reversible pressure differential relief valve design provides maximum capacity.
  • Designed for NYC installations with pre-drilled 304 stainless steel bolts/nuts (1/4 inch axially drilled holes) and a discharge restrictor plate.

Construction & Materials

  • Epoxy coated cast iron body for robust protection.
  • OSY resilient seated gate valves.
  • Cast iron relief valve body.
  • Stainless steel seat and trim.
  • Lead Free* copper silicon alloy test cocks.

Specifications

General

  • Nominal Pipe Size: 6 inch
  • Product Type: Reduced Pressure Zone Backflow Preventer
  • Shutoff Valves: OSY (Outside Stem & Yoke)
  • Body Material: Cast Iron
  • Coating: ArmorTek® Powder Coating, 3-part advanced epoxy system
  • Internal Parts: Stainless Steel
  • Seat Material: Stainless Steel
  • Trim Material: Stainless Steel
  • Relief Valve Body Material: Cast Iron
  • Test Cock Material: Lead Free* Copper Silicon Alloy
  • Special Features: Flood sensor with SentryPlus Alert® technology, Discharge Restrictor Plate, Pre-Drilled Bolts
  • Bolts/Nuts: Four sets of 304 Stainless Steel, with 1/4 inch axially drilled holes

Performance

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

Certificates & Approvals

  • ASSE 1013
  • AWWA C511-92
  • CSA B64.4
  • FM Approved
  • IAPMO PS 31
  • NSF Certified to NSF/ANSI 61-G
  • SBCCI (Standard Plumbing Code)
  • UL Classified File No. EX3185
  • USC Manual for Cross-Connection Control, 8th Edition
  • Approved by the Foundation for Cross-Connection Control and Hydraulic Research at the University of Southern California

FAQs

What is a Reduced Pressure Zone (RPZ) Backflow Preventer?

An RPZ backflow preventer protects potable water supplies from contamination by preventing the reverse flow of non-potable water, known as backpressure and backsiphonage. It uses two independent check valves and a pressure differential relief valve.

What does "OSY Shutoff" mean?

OSY stands for "Outside Stem & Yoke." These are gate valves where the stem rises out of the valve body when the valve is open, allowing for a clear visual indication of whether the valve is open or closed.

What are the key features of this "NYC version"?

This NYC version includes specific modifications such as four sets of 304 stainless steel bolts/nuts with a 1/4 inch hole drilled axially through the bolts, and a discharge restrictor plate, to meet particular New York City installation requirements.

How does the flood sensor feature work?

The integrated flood sensor with SentryPlus Alert® technology detects continuous discharge from the relief valve. When paired with an optional add-on connection kit, it can relay alerts via BMS, cellular communication, or the Sensor Control Monitor for integration with BAS or Wi-Fi platforms.

What is ArmorTek® coating, and why is it important?

ArmorTek® is a patented 3-part advanced epoxy coating system applied to the cast iron body and other iron components. It provides integrated protection against electrochemical corrosion and microbial-induced corrosion (MIC), extending the lifespan and reliability of the assembly.

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