4 957N-BFG-FS

Item Number: F111782
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$14,669.66
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Size: 4 inch
  • Weight: 135.0 lb
  • Assembly Type: Reduced Pressure Zone (RPZ)
  • Housing Material: 304 (Schedule 40) Stainless Steel
  • Shutoff Valves: UL/FM Grooved Gear Operated Butterfly
  • Features: SentryPlus Alert Flood Sensor
  • Installation: Horizontal N-Pattern
  • Maximum Working Pressure: 175 PSI
  • Lead Content: Lead Free* (<0.25% lead by weight)

Description

The Watts 957N-BFG-FS is a 4 inch Reduced Pressure Zone (RPZ) backflow preventer designed to protect potable water systems from contamination caused by backpressure or backsiphonage. This compact assembly features a durable 304 stainless steel housing, UL and FM approved grooved gear-operated butterfly valves with tamper switches, and a bottom-mounted cast stainless steel relief valve. An integrated SentryPlus Alert flood sensor detects excessive water discharges, providing critical notification capabilities when paired with an optional connection kit. It is approved for horizontal N-pattern installation and is rated for a maximum working pressure of 175 PSI.

Help Me Connect

This Watts Series 957 RPZ assembly is designed for horizontal N pattern installation. It features groove couplings for straightforward installation and integral pipeline adjustment, ensuring proper alignment with your existing piping system.

For advanced flood monitoring, the integrated SentryPlus Alert flood sensor requires an add-on connection kit to become active. These kits enable communication with Building Management Systems (BMS), cellular networks, or the Sensor Control Monitor for integration with BAS via RS-485 Modbus or the Nexa platform through Wi-Fi.

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Additional Details

This 4 inch Watts Series 957 Reduced Pressure Zone (RPZ) backflow preventer protects potable water systems from contamination due to backpressure or backsiphonage, commonly used in health hazard applications.

The assembly is designed for horizontal N pattern installation and is extremely compact.

Features

  • Equipped with a flood sensor featuring SentryPlus Alert technology to detect excessive water discharges from the relief valve. When paired with an add-on connection kit, the sensor relays alerts for potential flooding events, compatible with BMS, cellular communication, or the Sensor Control Monitor (RS-485 Modbus/Nexa Wi-Fi).
  • Robust 304 (Schedule 40) stainless steel housing and sleeve.
  • Includes UL and FM approved grooved gear operated butterfly valves with tamper switches.
  • Replaceable check disc rubber and patented torsion spring checks for lowest pressure loss and unmatched ease of serviceability.
  • Bottom mounted cast stainless steel relief valve.
  • Groove couplings for ease of installation and integral pipeline adjustment.
  • Compact design is approximately 70% lighter than traditional designs.

Notice: An add-on connection kit is required to activate the flood sensor. Without the connection kit, the sensor is a passive component that has no communication with any other device.

Specifications

General

  • Product Type: Reduced Pressure Zone (RPZ) Assembly
  • Brand: Watts
  • Series: 957
  • Size: 4 inch
  • Installation Pattern: Horizontal N-pattern
  • Protection Type: Backsiphonage and Backpressure

Materials

  • Housing & Sleeve Material: 304 (Schedule 40) Stainless Steel
  • Elastomer Material: EPDM, Silicone, Buna-N
  • Torsion Spring Checks Material: Noryl®, Stainless Steel
  • Check Discs Material: Reversible Silicone or EPDM
  • Test Cocks Body Material: Lead Free* Bronze
  • Pins & Fasteners Material: 300 Series Stainless Steel
  • Springs Material: Stainless Steel
  • Lead Content: Wetted surface contains less than 0.25% lead by weight

Performance

  • Maximum Working Pressure: 175 PSI (12.1 bar)
  • Temperature Range: 33°F - 140°F (0.5°C - 60°C)

Valves & Sensor

  • Shutoff Valve Type: UL/FM Approved Grooved Gear Operated Butterfly Valves with Tamper Switch
  • Flood Sensor: SentryPlus Alert Technology for continuous discharge detection

Certificates & Approvals

  • AWWA: C511-97
  • ASSE: 1013
  • CSA: B64.4
  • UL: Classified (BFG & OSY Only)
  • FM: Approved (BFG & OSY Only)
  • FCCCHR-USC: Approved by Foundation for Cross-Connection Control and Hydraulic Research at USC (excluding 10" N-pattern, 6" & 10" Z-pattern)
  • NSF: Certified to NSF/ANSI 61-G

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 due to reverse flow (backsiphonage or backpressure), commonly used in health hazard applications.

What type of shutoff valves does this 4-inch assembly include?

This assembly includes UL and FM approved grooved gear operated butterfly valves with tamper switches.

Does the integrated flood sensor provide active alerts out of the box?

No, the integrated flood sensor with SentryPlus Alert technology is a passive component initially. An add-on connection kit is required to activate the sensor and enable alert notifications through BMS, cellular networks, or the Sensor Control Monitor.

What materials are used for the housing and wetted surfaces?

The housing and sleeve are constructed from 304 (Schedule 40) stainless steel. The test cocks body is made from Lead Free* bronze, ensuring the wetted surface contains less than 0.25% lead by weight.

What installation orientation is this backflow preventer approved for?

This Watts Series 957N-BFG-FS is approved for horizontal N-pattern installation.

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