2 1/2 957-OSY-FS

Item Number: F111584
1 1
$7,481.34
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When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Nominal Size: 2 1/2 inch
  • Type: Reduced Pressure Zone (RPZ) Backflow Preventer
  • Shutoff Valves: OSY Resilient Seated Gate Valves
  • Body Material: 304 (Schedule 40) Stainless Steel
  • Flood Detection: SentryPlus Alert® Sensor
  • Maximum Working Pressure: 175 psi
  • Approvals: UL Classified, FM Approved, NSF/ANSI 61-G, ASSE 1013, CSA B64.4, AWWA C511-97
  • Installation: Horizontal, compact design

Description

The Watts Series 957 2 1/2 inch Reduced Pressure Zone (RPZ) backflow preventer protects potable water systems from contamination caused by backpressure or backsiphonage. This compact, lightweight unit features a durable 304 stainless steel body, OSY resilient seated gate valves, and two torsion spring check valves. An integrated SentryPlus Alert® flood sensor detects excessive relief valve discharge, offering proactive monitoring when paired with an add-on connection kit. Approved for horizontal installation, it ensures reliable health hazard protection. It meets ASSE 1013, CSA B64.4, UL, FM, and NSF/ANSI 61-G standards with a maximum working pressure of 175 psi. Item F111584.

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Installation Guidelines

  • This Watts Series 957 Reduced Pressure Zone assembly is approved for horizontal installation. Ensure it is installed in accordance with the direction of the flow arrow for proper operation.
  • The assembly features groove fittings that allow for integral pipeline adjustment, simplifying installation and alignment.
  • The integral flood sensor requires an add-on sensor connection kit to activate flood alerts. These kits enable compatibility with Building Management Systems (BMS), cellular communication, and the Sensor Control Monitor for integration with Building Automation Systems (BAS) via RS-485 Modbus or the Nexa® platform through Wi-Fi connectivity.
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Additional Details

The Watts Series 957 2 1/2 inch Reduced Pressure Zone (RPZ) assembly backflow preventer provides protection to potable water systems from contamination due to backpressure or backsiphonage, particularly where potential health hazards exist. This assembly is designed for horizontal installation and features a compact, lightweight stainless steel body.

It includes a flood sensor with SentryPlus Alert® technology to detect continuous discharge from the relief valve, offering proactive monitoring for potential flooding events.

Components

  • Stainless Steel Body: Durable 304 (Schedule 40) stainless steel housing and sleeve with a quick access design.
  • Shutoff Valves: Features UL and FM Approved Outside Stem and Yoke (OSY) resilient seated gate valves for reliable operation.
  • Check Valves: Two independent torsion spring check modules with replaceable elastomer discs for drip-tight closure.
  • Relief Valve: A bottom-mounted, corrosive-resistant cast stainless steel pressure relief valve.
  • Test Cocks: Included for easy testing and maintenance.

Flood Sensor Technology

  • The integrated flood sensor with SentryPlus Alert® technology monitors for 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 compatibility with Building Management Systems (BMS), cellular communication, and the Sensor Control Monitor for integration with Building Automation Systems (BAS) via RS-485 Modbus or the Nexa® platform through Wi-Fi connectivity.

Specifications

General

  • Product Type: Reduced Pressure Zone Assembly Backflow Preventer
  • Nominal Size: 2 1/2 inch
  • Series: 957
  • Valve Type: OSY Resilient Seated Gate Valves
  • Installation Orientation: Horizontal (with direction of flow arrow)
  • Flood Detection: Integrated SentryPlus Alert® Flood Sensor
  • Design: Extremely compact, 70% lighter than traditional designs
  • Adjustability: Groove fittings allow integral pipeline adjustment
  • Serviceability: Unmatched ease of serviceability

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 Body: Lead Free* bronze
  • Pins & Fasteners: 300 Series stainless steel
  • Springs: Stainless steel

Performance

  • Temperature Range: 33°F - 140°F (0.5°C - 60°C)
  • Maximum Working Pressure: 175 psi (12.1 bar)
  • Wetted Surface Lead Content: Less than 0.25% by weight

Certificates & Approvals

  • Approved by Foundation for Cross-Connection Control and Hydraulic Research at USC (FCCCHR-USC)
  • AWWA Standard: AWWA C511-97
  • ASSE Standard: ASSE 1013
  • CSA Standard: CSA B64.4
  • UL Classification: UL Classified
  • FM Approval: FM Approved
  • NSF Certification: NSF/ANSI 61-G

FAQs

What is the primary function of the Watts Series 957 RPZ assembly?

The primary function of this 2 1/2 inch Reduced Pressure Zone (RPZ) backflow preventer is to protect potable water systems from contamination. It prevents the reverse flow of liquids into the system due to both backpressure and backsiphonage, especially in health hazard applications.

How does the integrated flood sensor work?

The Watts Series 957 RPZ assembly includes a flood sensor with SentryPlus Alert® technology that detects excessive water discharges from the relief valve. When connected to an add-on connection kit, this sensor activates to send alerts for potential flooding events, enhancing proactive monitoring.

What materials are used in the construction of this backflow preventer?

The housing and sleeve are constructed from durable 304 (Schedule 40) stainless steel. Key components like elastomers are EPDM, silicone, and Buna-N, while check discs are reversible silicone or EPDM. Test cocks feature a Lead Free* bronze body, and springs, pins, and fasteners are made from stainless steel.

What are the installation requirements for this Watts Series 957 assembly?

This backflow preventer is approved for horizontal installation. It must be installed in accordance with the direction of the flow arrow to ensure proper operation. The groove fittings allow for integral pipeline adjustment, simplifying the installation process.

What certifications and approvals does this backflow preventer hold?

The Watts Series 957 2 1/2 inch RPZ assembly is UL Classified, FM Approved, and NSF/ANSI 61-G certified. It also meets ASSE 1013, CSA B64.4, and AWWA C511-97 standards, and is approved by the Foundation for Cross-Connection Control and Hydraulic Research at USC.

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