4 LF909-OSY-FS

Item Number: 88009302
1 1
$20,939.95
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Size: 4 inch
  • Weight: 563.0 lb
  • Body Material: Cast Iron
  • Coating: ArmorTek® Advanced Epoxy
  • Protection: Reduced Pressure Zone Assembly
  • Shutoff Valves: Outside Stem and Yoke (OSY)
  • Sensor: Flood sensor with SentryPlus Alert® technology
  • Maximum Working Pressure: 175 PSI
  • Lead Free Construction

Description

The Watts LF909 4 inch Reduced Pressure Zone backflow preventer assembly with OSY shutoff and flood sensor provides essential cross-connection control for potable water supplies. It prevents reverse flow caused by backsiphonage and backpressure, making it suitable for health hazard connections. Featuring a durable cast iron body with advanced ArmorTek epoxy coating, it resists corrosion and microbial-induced damage. The assembly includes a flood sensor with SentryPlus Alert technology to detect excessive water discharges, signaling facility personnel via an add-on connection kit. With a maximum working pressure of 175 PSI and lead-free construction, this 4-inch backflow preventer ensures reliable and compliant water system protection. Item number 88009302.

Help Me Connect

Flood Sensor Connectivity

This backflow preventer includes a flood sensor with SentryPlus Alert® technology. To activate and relay alerts for potential flooding events, an add-on connection kit is required. Connection kit options include those compatible with BMS (Building Management Systems), cellular communication, and the Sensor Control Monitor, which enables integration with BAS (Building Automation Systems) via RS-485 Modbus or the Nexa® platform through Wi-Fi.

View full details

Additional Details

This 4 inch lead free reduced pressure zone backflow preventer assembly prevents the reverse flow of polluted water from entering into the potable water supply due to backsiphonage and/or backpressure. It is ideal for protection in continuous pressure piping applications and at cross-connections identified as health hazards and from other contaminants found at the service line entrance.

Features & Benefits

  • Replaceable seats for simplified maintenance.
  • Stainless steel internal parts ensure durability.
  • Includes captured spring check assemblies.
  • Features fused epoxy coated and lined checks.
  • ArmorTek coating technology designed to resist corrosion, including microbial-induced corrosion (MIC), and protect exposed metal substrates.
  • Equipped with an industrial-strength sensing hose.
  • Has a field reversible relief valve.
  • Air-in/water-out relief valve design provides maximum capacity during emergency conditions.
  • Includes a flood sensor on the relief valve for discharge detection.
  • Flood alerts feature is activated with an add-on sensor connection kit, compatible with BMS and cellular network communication.
  • Utilizes outside stem and yoke (OSY) resilient seated gate valves.
  • Lead Free* construction ensures compliance with installation requirements.

Specifications

General

  • Body Material: Cast Iron
  • Coating: ArmorTek® powder coating, applied to internal and external surfaces
  • Seat: Stainless Steel
  • Trim: Stainless Steel
  • Relief Valve Body Material (4"-10"): Cast Iron
  • Test Cock: Lead Free* copper silicon alloy
  • Shutoff Valves: Outside Stem and Yoke (OSY) resilient seated gate valves

Performance

  • Temperature Range: 33°F to 110°F (0.5°C to 43°C) continuous, 140°F (60°C) intermittent
  • Maximum Working Pressure: 175 PSI (12.06 Bar)

Certificates & Approvals

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

FAQs

What is the primary function of the Watts LF909 Reduced Pressure Zone Assembly?

The primary function is to provide cross-connection control, preventing the reverse flow of polluted water into the potable water supply due to backsiphonage and backpressure. It is ideal for protecting against health hazards in various piping applications.

What is ArmorTek® coating technology?

ArmorTek® is a patented three-part advanced epoxy system applied to the backflow preventer's iron components, both internally and externally. It is engineered to reduce microbial-induced corrosion (MIC) and protect exposed metal substrates, enhancing the assembly's lifespan.

How does the flood sensor work on the LF909 assembly?

The LF909 includes a flood sensor with SentryPlus Alert® technology to detect excessive water discharges from the relief valve. When paired with an add-on connection kit, the sensor activates to relay alerts for potential flooding events to facility personnel for corrective action.

What is the maximum operating pressure for this assembly?

The maximum working pressure for this Watts LF909 Reduced Pressure Zone Assembly is 175 PSI (12.06 Bar), making it suitable for continuous pressure piping applications.

Is this product compliant with lead-free standards?

Yes, the Series LF909 features Lead Free* construction. This means the wetted surface of the product that contacts consumable water contains less than 0.25% of lead by weight, complying with current lead-free installation requirements.

Related Products

1 3