2.5 957N-BFG-FS

Item Number: F111780
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$11,048.55
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Reduced Pressure Zone Assembly Backflow Preventer
  • Weight: 118.0 lb
  • Size: 2 1/2 inch
  • N-Pattern for horizontal installation
  • Integrated SentryPlus Alert Flood Sensor
  • 304 (Schedule 40) Stainless Steel Housing
  • UL/FM Grooved Butterfly Valve Shutoffs with Tamper Switch
  • Maximum Working Pressure: 175 psi
  • Wetted surfaces contain less than 0.25% lead by weight

Description

The WATTS Series 957N-BFG-FS 2 1/2 inch Reduced Pressure Zone Assembly Backflow Preventer protects potable water systems from contamination by backsiphonage or backpressure in health hazard applications. It features a compact, lightweight design with a 304 stainless steel housing, UL/FM grooved gear-operated butterfly valves, and patented torsion spring checks for low pressure loss. An integrated SentryPlus Alert flood sensor detects excessive discharges, offering advanced monitoring when paired with an optional connection kit. Approved by ASSE, CSA, UL, FM, NSF, and AWWA, this lead-free assembly ensures reliable performance and compliance for horizontal N-pattern installations. Item number F111780.

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Connections & Installation

  • This 2 1/2 inch reduced pressure zone assembly features grooved couplings for both inlet and outlet connections, allowing for straightforward installation and integral pipeline adjustment.
  • The assembly is designed for horizontal N-pattern installation and must be installed in accordance with the direction of the flow arrow to ensure proper function and code compliance.
  • The integrated flood sensor requires an optional add-on connection kit (not included) to activate its alert capabilities for BMS, cellular, or Wi-Fi communication via a Sensor Control Monitor.
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Additional Details

The WATTS Series 957N-BFG-FS 2 1/2 inch Reduced Pressure Zone Assembly Backflow Preventer is designed to protect potable water systems from contamination due to backpressure or backsiphonage, commonly used in health hazard applications. This compact assembly incorporates advanced features for reliable system integrity and monitoring.

Key Features

  • Extremely Compact Design: Approximately 70% lighter than traditional designs, allowing for installation in smaller enclosures.
  • Robust Construction: Features a 304 (Schedule 40) stainless steel housing and sleeve for durability and corrosion resistance.
  • Advanced Shutoffs: Equipped with UL and FM approved grooved gear operated butterfly valves with tamper switch for reliable control.
  • Patented Torsion Spring Checks: Provides the lowest pressure loss for efficient operation.
  • Ease of Serviceability: Unmatched design for straightforward maintenance.
  • Grooved Couplings: Allows for integral pipeline adjustment and simplified installation.
  • Bottom-Mounted Relief Valve: Features a cast stainless steel relief valve for consistent performance.
  • Replaceable Check Disc Rubber: Ensures long-term reliability and easy maintenance.

SentryPlus Alert Flood Sensor

  • Includes an integrated SentryPlus Alert flood sensor on the relief valve to detect excessive water discharges.
  • When paired with an optional add-on sensor connection kit (not included), the sensor relays signals to facility personnel for corrective action, helping to limit flooding and costly damage.
  • Compatible with BMS and cellular network communication options, including integration with BAS via RS-485 Modbus or the Nexa platform through Wi-Fi, when used with a Sensor Control Monitor.

Installation, operation, and maintenance of this product must comply with all required instructions, codes, and regulations. The flood sensor does not replace the need for proper drainage in the event of a discharge, and proper installation by a trained professional is required.

Specifications

  • Product Type: Reduced Pressure Zone Assembly Backflow Preventer
  • Series: 957
  • Size: 2 1/2 inch
  • Pattern: N-Pattern (Horizontal Installation)
  • Shutoff Type: Grooved Gear Operated Butterfly Valves with Tamper Switch
  • Flood Sensor: Integrated SentryPlus Alert Flood Sensor
  • Pressure Rating: 175 psi Maximum Working Pressure
  • Temperature Range: 33°F - 140°F (0.5°C - 60°C)
  • Lead Content: Wetted surface contains less than 0.25% lead by weight

Materials

  • Housing & Sleeve: 304 (Schedule 40) Stainless Steel
  • Elastomers: EPDM, Silicone, Buna-N
  • Torsion Spring Checks: Noryl, Stainless Steel
  • Check Discs: Reversible Silicone or EPDM
  • Test Cocks: Lead Free* Bronze Body
  • Pins & Fasteners: 300 Series Stainless Steel
  • Springs: Stainless Steel

Dimensions (2 1/2 inch, 957NBFG)

  • Overall Length (G): 32 1/2 in (826 mm)
  • Height (H): 23 in (584 mm)
  • Width (I): 15 1/2 in (394 mm)
  • Distance J: 9 1/2 in (241 mm)
  • Distance M: 19 3/4 in (502 mm)
  • Distance P: 11 13/16 in (300 mm)
  • Weight: 67 lb (30 kg)

Certificates & Approvals

  • ASSE 1013
  • CSA B64.4
  • UL Listed
  • FM Approved
  • NSF Listed
  • AWWA C511-97
  • Approved by Foundation for Cross Connection Control and Hydraulic Research at USC (FOCCCHR-USC)

FAQs

What is the primary purpose of the WATTS Series 957N-BFG-FS backflow preventer?

Its primary purpose is to protect potable water systems from contamination caused by backsiphonage or backpressure, particularly in health hazard applications where a potential health risk exists.

Does this backflow preventer include a flood sensor?

Yes, it features an integrated SentryPlus Alert flood sensor on the relief valve to detect excessive water discharges. An optional add-on connection kit (not included) is required to activate its alert functionalities and enable communication.

What type of shutoff valves are included with this assembly?

This assembly comes with UL and FM approved grooved gear-operated butterfly valves, which also include a tamper switch for added security and monitoring capabilities.

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

The WATTS 957N-BFG-FS has a maximum working pressure of 175 psi and an operating temperature range of 33°F to 140°F (0.5°C to 60°C).

Is this product suitable for horizontal installation?

Yes, this model is specifically designed for horizontal N-pattern installation. It must be installed according to the direction of the flow arrow for proper operation and code compliance.

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