4 957N-QT

Item Number: 0111670
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$12,748.51
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Size: 4 inch
  • Weight: 152.0 lb
  • Housing: 304 (Schedule 40) Stainless Steel
  • Shutoffs: Quarter-turn Ball Valves
  • Maximum Working Pressure: 175 psi
  • Approved for Horizontal N-pattern Installation
  • Extremely Compact Design
  • Patented Torsion Spring Check Modules
  • Wetted Surface Lead Content: Less than 0.25%

Description

The Watts Series 957 Reduced Pressure Zone Assembly Backflow Preventer provides critical protection for potable water systems. This 4 inch, horizontal N-pattern unit prevents contamination from backsiphonage and backpressure in health hazard applications, meeting national plumbing codes. Constructed with a durable 304 stainless steel housing and sleeve, it features quarter-turn ball valve shutoffs and patented torsion spring checks for reliability. Its compact design allows for installation in small enclosures. With a maximum working pressure of 175 psi and Lead Free* compliance, this backflow preventer is ideal for fire protection and continuous pressure piping.

Help Me Connect

Installation Orientation

  • This backflow preventer is approved for horizontal N pattern installation.
  • Ensure the assembly is installed in accordance with the direction of the flow arrow.

Connection Type

  • Features groove couplings for straightforward installation and pipeline alignment.
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Additional Details

The Watts Series 957 Reduced Pressure Zone Assembly Backflow Preventer is a 4 inch assembly designed to protect potable water systems from contamination due to backsiphonage or backpressure.

This assembly is ideal for safeguarding continuous pressure piping applications and critical cross-connections where health hazards or other contaminants are present, meeting national plumbing codes and water authority requirements.

Design & Construction

  • Features an extremely compact design, making it significantly lighter than traditional assemblies and allowing for installation in smaller enclosures.
  • Constructed with a 304 (Schedule 40) stainless steel housing and sleeve for durability and corrosion resistance.
  • Includes a quick access sleeve for enhanced serviceability.
  • Equipped with patented torsion spring check modules and replaceable check disc rubber for reliable performance and easy maintenance.
  • Features a corrosive resistant stainless steel bottom mounted pressure relief valve.

Operation & Installation

  • Utilizes quarter turn ball valve shutoffs for easy operation.
  • Approved for horizontal N pattern installation, ensuring proper alignment with the direction of flow.
  • Groove fittings facilitate ease of installation and pipeline adjustment.
  • Includes a flood sensor on the relief valve to detect excessive water discharges, signaling facility personnel for corrective action (requires add-on connection kit).
The flood sensor requires an add-on connection kit to be active and does not replace the need to comply with all installation, operation, and maintenance codes or to provide proper drainage.

Specifications

  • Product Type: Reduced Pressure Zone Assembly
  • Size: 4 inch
  • Orientation: Horizontal N-pattern
  • Shutoffs: Quarter-turn Ball Valves
  • Maximum Working Pressure: 175 psi (12.1 bar)
  • Temperature Range: 33°F - 140°F (0.5°C - 60°C)
  • Wetted Surface Lead Content: Less than 0.25%

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
  • Pins & Fasteners: 300 Series Stainless Steel
  • Springs: Stainless Steel

Certificates & Approvals

  • ASSE 1013
  • CSA B64.4
  • UL Classified
  • FM Approved
  • NSF Certified to NSF/ANSI 61-G
  • FCCCHR-USC
  • AWWA C511-97

FAQs

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

It is designed to protect potable water systems from contamination caused by backsiphonage or backpressure, particularly in health hazard cross-connection applications and continuous pressure piping.

What material is the housing and sleeve made from?

The housing and sleeve are constructed from 304 (Schedule 40) stainless steel, offering durability and corrosion resistance.

What is the maximum operating pressure and temperature range for this backflow preventer?

The maximum working pressure is 175 psi (12.1 bar), and it operates within a temperature range of 33°F to 140°F (0.5°C to 60°C).

Are the wetted surfaces of this product lead-free?

Yes, the wetted surface of this product that contacts consumable water contains less than 0.25% of lead by weight, qualifying it as Lead Free*.

What type of shutoff valves does this assembly use?

This assembly is equipped with quarter-turn ball valve shutoffs for easy operation and control.

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