6 LF909-DOSY-FS

Item Number: 88009318
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$30,434.99
Limited Stock (4)
Estimated transit time: 2 to 5 Business Days Eligible for Express Shipping

Brand - Watts
  • Size: 6 inch
  • Weight: 1032.0 lb
  • Lead Free Construction: Yes
  • Body Material: Cast Iron (ArmorTek Coated)
  • Shutoff Valves: Domestic OSY
  • Maximum Working Pressure: 175 psi
  • Temperature Range: 33°F to 110°F continuous
  • Flood Sensor: SentryPlus Alert® Technology
  • Replaceable Seats: Yes

Description

This 6 inch Watts LF909 Series Lead Free Reduced Pressure Zone Backflow Preventer Assembly protects potable water supplies from pollution due to backsiphonage and backpressure. It features a durable ArmorTek® epoxy coated cast iron body and domestic OSY gate valves. The integrated SentryPlus Alert® flood sensor detects excessive discharges, offering proactive flood monitoring when paired with an add-on connection kit for BMS, cellular, or Wi-Fi integration. Designed for health hazard cross-connections and continuous pressure piping, it provides reliable protection with replaceable stainless steel internal parts and a field reversible relief valve. Item number 88009318.

Help Me Connect

Connecting this Backflow Preventer

  • The assembly includes domestic Outside Stem and Yoke (OSY) gate valves for connection.
  • Install with an add-on connection kit to fully activate the SentryPlus Alert® flood sensor for communication via BMS, cellular, or Wi-Fi (Nexa® platform).
  • For horizontal installations, use Series 909 AG air gaps if a drain line is being connected.
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Additional Details

This 6 inch lead free reduced pressure zone backflow preventer assembly is designed to prevent the reverse flow of polluted water from entering the potable water supply due to backsiphonage and backpressure. It is ideal for protection in continuous pressure piping applications and at cross-connections identified as health hazards.

Construction & Materials

  • Features an epoxy coated cast iron body, domestic outside stem and yoke resilient seated gate valves, captured spring check valves, replaceable seats, and top mounted test cocks.
  • The coating utilizes ArmorTek®, a patented 3-part advanced epoxy coating system engineered to limit both microbial induced corrosion (MIC) and exposed metal substrate corrosion.
  • Lead Free* construction complies with current installation requirements.

Flood Sensor & Alerts

  • 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.
  • Connection kit options include BMS, cellular communication, and the Sensor Control Monitor for integration with BAS via RS-485 Modbus or the Nexa® platform through Wi-Fi.
  • The sensor is installed on the assembly exterior and does not alter assembly functions or certifications.

Performance & Design

  • Field reversible pressure differential relief valve with a unique air-in/water-out design provides maximum capacity during emergency conditions.
  • Replaceable seats and stainless steel internal parts for ease of maintenance.
  • No special tools required for servicing.
Note: An add-on connection kit is required to activate the flood sensor. Without the connection kit, the sensor is a passive component with no communication.

Specifications

General

  • Product Type: Reduced Pressure Zone Backflow Preventer
  • Assembly Size: 6 inch
  • Connection Type: Domestic Outside Stem and Yoke (OSY) Gate Valves
  • Lead Free: Yes

Materials

  • Check Valve Body: Cast Iron
  • Relief Valve Body: Cast Iron
  • Coating: ArmorTek® Powder Coating (internal and external surfaces)
  • Seat: Stainless Steel
  • Trim: Stainless Steel
  • Test Cock: 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

  • ASSE 1013
  • AWWA C511-92
  • CSA B64.4
  • UL Classified
  • FM Approved
  • NSF Certified to NSF/ANSI 61-G
  • IAPMO PS 31
  • SBCCI (Standard Plumbing Code)
  • Approved by Foundation for Cross-Connection Control and Hydraulic Research at the University of Southern California

FAQs

What does "Lead Free" construction mean for this backflow preventer?

"Lead Free" construction ensures that the wetted surface of this product, which contacts consumable water, contains less than 0.25% lead by weight, complying with current Lead Free installation requirements.

How does the ArmorTek® coating benefit this backflow assembly?

The ArmorTek® coating is a patented 3-part advanced epoxy system applied to the cast iron body and internal surfaces. It is designed to resist both microbial induced corrosion (MIC) and general exposed metal substrate corrosion, extending the product's lifespan.

What is the purpose of the SentryPlus Alert® flood sensor?

The SentryPlus Alert® flood sensor detects excessive water discharges from the relief valve. When an add-on connection kit is used, it can relay alerts to facility personnel via BMS, cellular, or Wi-Fi (Nexa® platform), helping to prevent costly flooding.

What is the maximum working pressure and temperature range for this assembly?

This backflow preventer has a maximum working pressure of 175 psi (12.06 bar). Its continuous temperature range is 33°F to 110°F (0.5°C to 43°C), with an intermittent temperature range of up to 140°F (60°C).

Are special tools required to service the Watts LF909-DOSY-FS backflow preventer?

No, the Watts LF909 Series backflow preventer assembly is designed for ease of maintenance and does not require special tools for servicing. It features replaceable seats and stainless steel internal parts.

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