4 957Z-OSY-FS

Item Number: F111598
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$13,336.57
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When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Size: 4 inch
  • Weight: 252.0 lb
  • Watts Series 957 Reduced Pressure Zone Assembly
  • Z-pattern installation with OSY shutoff valves
  • Integrated flood sensor with SentryPlus Alert® technology
  • Housing & Sleeve Material: 304 (Schedule 40) Stainless Steel
  • Maximum Operating Pressure: 175 PSI
  • Temperature Range: 33°F - 140°F
  • UL Classified, FM Approved, and NSF/ANSI 61-G Certified

Description

The Watts Series 957 4-inch Reduced Pressure Zone Assembly Backflow Preventer safeguards potable water systems from contamination caused by backpressure or backsiphonage. This Z-pattern assembly features durable 304 stainless steel construction, UL and FM Approved OSY shutoff valves, and an integrated flood sensor with SentryPlus Alert® technology for discharge detection. Its compact design allows for installations in limited spaces while supporting a maximum working pressure of 175 PSI. Certified to AWWA, ASSE, CSA, and NSF standards, it provides reliable health hazard protection. Item number F111598.

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Installation & Connections

The Watts Series 957 backflow preventer features grooved couplings for straightforward installation and integral pipeline adjustment. This assembly is designed for horizontal Z-pattern installation, ensuring proper flow direction. To enable alert notifications from the integrated flood sensor, an add-on sensor connection kit is required. This kit allows compatibility with Building Management Systems (BMS), cellular communication, 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) assembly backflow preventer provides robust protection for potable water systems from contamination caused by backpressure or backsiphonage, particularly in health hazard applications.

Key Features

  • Features an integrated flood sensor with SentryPlus Alert® technology to detect excessive water discharges from the relief valve.
  • Extremely compact design, approximately 70% lighter than traditional designs, allowing for installation in smaller enclosures.
  • Approved for horizontal Z-pattern installation.
  • Equipped with UL and FM Approved outside stem and yoke (OSY) resilient seated gate valves.
  • Includes groove fittings for integral pipeline adjustment and ease of installation.

Construction & Design

  • Robust 304 (Schedule 40) stainless steel housing and sleeve.
  • Patented torsion spring checks designed for lowest pressure loss and unmatched ease of serviceability.
  • Replaceable check disc rubber made of reversible silicone or EPDM.
  • Features a bottom mounted cast stainless steel relief valve.
  • Lead Free* bronze body test cocks.

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

Specifications

  • Size: 4 inch
  • Model Series: Watts Series 957
  • Installation Pattern: Z-pattern
  • Shutoff Valve Type: OSY (Outside Stem and Yoke) Resilient Seated Gate Valves
  • Flood Sensor: Integrated with SentryPlus Alert® technology
  • Housing & Sleeve Material: 304 (Schedule 40) Stainless Steel
  • Check Disc Material: Reversible Silicone or EPDM Elastomer
  • Torsion Spring Check Material: Noryl®, Stainless Steel
  • Test Cock Body Material: Lead Free* Bronze
  • Pins & Fastener Material: 300 Series Stainless Steel
  • Spring Material: Stainless Steel
  • 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%

Certificates & Approvals

  • AWWA C511-97
  • ASSE 1013
  • CSA B64.4
  • UL Classified
  • FM Approved
  • NSF/ANSI 61-G
  • FCCCHR-USC Approved (for 4 inch Z-pattern installation)

FAQs

What is the primary purpose of the Watts Series 957 Reduced Pressure Zone Assembly?

Its primary purpose is to protect potable water systems from contamination that can occur due to backpressure or backsiphonage, especially in health hazard applications.

How does the integrated flood sensor function?

The flood sensor with SentryPlus Alert® technology detects excessive water discharges from the relief valve. When an add-on connection kit is used, it relays alerts to facility personnel or integrated systems.

Is an additional connection kit necessary to utilize the flood sensor's alert features?

Yes, an add-on connection kit is required to activate the flood sensor's communication and alert capabilities. Without it, the sensor is a passive component.

What materials are used for the main components of this backflow preventer?

The housing and sleeve are constructed from 304 (Schedule 40) stainless steel, check discs are reversible silicone or EPDM, and test cocks have Lead Free* bronze bodies.

What are the key certifications and approvals for this 4-inch Series 957 assembly?

It is UL Classified, FM Approved, NSF/ANSI 61-G Certified, and approved by AWWA C511-97, ASSE 1013, CSA B64.4, and FCCCHR-USC for 4-inch Z-pattern installations.

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