8 957Z-OSY

Item Number: 0111600
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$32,877.73
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Nominal Size: 8 inch
  • Weight: 709.0 lb
  • Reduced Pressure Zone (RPZ) Backflow Preventer
  • OSY Resilient Seated Gate Valves
  • 304 Stainless Steel Housing and Sleeve
  • Maximum Working Pressure: 175 psi
  • Temperature Range: 33°F - 140°F
  • Approved for Horizontal Z-Pattern Installation
  • UL Classified and FM Approved

Description

This 8 inch Watts 957Z-OSY Reduced Pressure Zone (RPZ) Backflow Preventer protects potable water systems from contamination caused by backsiphonage or backpressure. Featuring a durable 304 stainless steel housing, UL Classified and FM Approved OSY resilient seated gate valves, and a bottom-mounted cast stainless steel relief valve, it ensures reliable operation. The compact design allows for installation in smaller enclosures. Approved for horizontal Z-pattern installation, it withstands a maximum working pressure of 175 psi and a temperature range of 33°F to 140°F. Groove fittings provide easy installation and pipeline adjustment.

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Installation & Connections

  • This backflow preventer is designed for horizontal Z-pattern installation. Ensure proper alignment with the direction of flow.
  • Utilizes groove couplings for ease of installation and integral pipeline adjustment.
  • For activating the flood sensor, an add-on connection kit is required.
  • When installing a drain line, use Watts 957AG air gaps and attach brackets directly onto the flood sensor.
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Additional Details

This 8 inch Watts Series 957 Reduced Pressure Zone (RPZ) backflow preventer, model 957Z-OSY, is designed to protect potable water systems from contamination due to backsiphonage or backpressure in accordance with national plumbing codes.

It is suitable for continuous pressure piping applications and at cross-connections identified as health hazards.

Features

  • 304 (Schedule 40) stainless steel housing and sleeve for durability.
  • Equipped with UL Classified and FM Approved outside stem and yoke (OSY) resilient seated gate valves.
  • Approved for horizontal Z-pattern installation.
  • Features an extremely compact design, allowing the use of smaller enclosures.
  • Includes a bottom mounted cast stainless steel relief valve.
  • Utilizes patented torsion spring check modules for unmatched ease of serviceability.
  • Groove fittings allow integral pipeline adjustment and ease of installation.
  • Comes with replaceable check disc rubber.
  • Sensor on relief valve for flood detection (requires add-on connection kit).

Specifications

General

  • Nominal Size: 8 inch
  • Assembly Type: Reduced Pressure Zone (RPZ) Backflow Preventer
  • Shutoff Valve Type: OSY (Outside Stem and Yoke) Resilient Seated Gate Valves
  • Installation Pattern: Z-Pattern Horizontal
  • Housing & Sleeve Material: 304 (Schedule 40) Stainless Steel
  • Relief Valve Material: Cast Stainless Steel
  • Check Disc Material: Replaceable Rubber (Silicone or EPDM)
  • Test Cock Body Material: Lead Free* Bronze
    *The wetted surface contacted by consumable water contains less than 0.25% of lead by weight.
  • Elastomers: EPDM, Silicone, Buna-N
  • Torsion Spring Check Material: Noryl®, Stainless Steel
  • Pins & Fasteners Material: 300 Series Stainless Steel
  • Springs Material: Stainless Steel
  • Design: Extremely Compact

Performance

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

Certificates & Approvals

  • Approved by: FCCCHR-USC
  • Standard: AWWA C511-97
  • Standard: ASSE 1013
  • Standard: CSA B64.4
  • Classification: UL Classified (BFG & OSY Only)
  • Approval: FM Approved (BFG & OSY Only)
  • Certification: NSF/ANSI 61-G

FAQs

What is the primary use of the Watts 957Z-OSY backflow preventer?

This backflow preventer is designed to protect potable water systems from contamination due to backsiphonage or backpressure, in accordance with national plumbing codes. It is suitable for continuous pressure piping and health hazard cross-connection applications.

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

The housing and sleeve are constructed from 304 (Schedule 40) stainless steel, with a cast stainless steel relief valve. Test cocks feature a Lead Free* bronze body, and elastomers are EPDM, silicone, and Buna-N.

What is the maximum operating pressure and temperature range?

The Watts 957Z-OSY backflow preventer has a maximum working pressure of 175 psi (12.1 bar). Its operating temperature range is 33°F to 140°F (0.5°C to 60°C).

Are the shutoff valves UL Classified and FM Approved?

Yes, the outside stem and yoke (OSY) resilient seated gate valves on this assembly are UL Classified and FM Approved.

How does the flood sensor function, and what is required to activate it?

The flood sensor detects excessive water discharges from the relief valve. To activate its alert features for communication with BMS or cellular networks, an add-on sensor connection kit is required.

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