4 957Z-QT-FS

Item Number: F111779
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$12,748.51
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When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Product Type: Reduced Pressure Zone Assembly Backflow Preventer
  • Weight: 152.0 lb
  • Nominal Pipe Size: 4 inch
  • Shutoff Type: Quarter-Turn Ball Valves
  • Housing & Sleeve Material: 304 (Schedule 40) Stainless Steel
  • Maximum Working Pressure: 175 psi
  • Flood Sensor: SentryPlus Alert® Technology
  • Lead Content: Less than 0.25% by weight (Wetted Surface)
  • Approved for horizontal Z-pattern installation

Description

This Watts 4 inch Reduced Pressure Zone (RPZ) backflow preventer assembly protects potable water systems from contamination by backsiphonage or backpressure, especially in health hazard applications. Its compact design is 70% lighter than traditional models and is approved for horizontal Z-pattern installation. The unit features 304 stainless steel housing, quarter-turn ball valve shutoffs, and a SentryPlus Alert® flood sensor to detect relief valve discharge. When connected with an add-on kit, the sensor provides alerts for flooding. It operates up to 175 psi and meets ASSE 1013, CSA B64.4, NSF/ANSI 61-G, and AWWA C511-97 standards, with lead-free wetted surfaces.

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Installation Orientation

  • This assembly is approved for horizontal Z-pattern installation. Ensure the assembly is installed in accordance with the direction of the flow arrow.
  • The use of groove fittings allows for integral pipeline adjustment and simplifies installation.

Flood Sensor Connectivity

  • An add-on sensor connection kit is required to activate the flood sensor's alert features. Without this kit, the sensor operates as a passive component.
  • Connection kit options allow compatibility with BMS (Building Management Systems), cellular communication, or integration with BAS (Building Automation Systems) via RS-485 Modbus or the Nexa® platform through Wi-Fi.
  • When installing a drain line, use 957AG air gaps and attach the air gap brackets directly onto the flood sensor.
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Additional Details

This is a Watts 4 inch Reduced Pressure Zone (RPZ) backflow preventer assembly designed to protect potable water systems from contamination due to backsiphonage or backpressure, particularly in health hazard applications. It is approved for horizontal Z-pattern installation.

Features

  • Equipped with a flood sensor with SentryPlus Alert® technology to detect excessive water discharges from the relief valve, limiting potential flooding and damage.
  • When paired with an add-on connection kit, the sensor relays alerts for flooding events, compatible with BMS, cellular communication, or the Nexa® platform via RS-485 Modbus or Wi-Fi.
  • Extremely compact design, 70% lighter than traditional designs, allowing for installation in smaller enclosures.
  • Constructed with 304 (Schedule 40) stainless steel housing and sleeve for durability.
  • Features quarter-turn ball valve shutoffs for easy operation.
  • Groove fittings facilitate integral pipeline adjustment and ease of installation.
  • Patented torsion spring checks provide lowest pressure loss and unmatched ease of serviceability.
  • Includes a bottom-mounted cast stainless steel relief valve.
  • Replaceable check disc rubber for maintenance.

The wetted surface of this product contacted by consumable water contains less than 0.25% of lead by weight.

Specifications

General

  • Product Type: Reduced Pressure Zone Assembly Backflow Preventer
  • Nominal Pipe Size: 4 inch
  • Shutoff Type: Quarter-Turn Ball Valves
  • Pattern: Z-Pattern
  • Flood Sensor: SentryPlus Alert® Technology
  • Lead Content: Less than 0.25% by weight (Wetted Surface)

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

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

Certificates & Approvals

  • ASSE 1013
  • CSA B64.4
  • NSF/ANSI 61-G
  • AWWA C511-97

FAQs

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

The primary function is to protect potable water systems from contamination caused by backsiphonage or backpressure, particularly in applications where health hazards exist. It prevents the reverse flow of non-potable liquids into the clean water supply.

What size is this particular backflow preventer, and what type of shutoffs does it feature?

This specific backflow preventer is 4 inches. It features quarter-turn ball valve shutoffs, which allow for quick and easy operation.

What material is the housing and sleeve of this backflow preventer made from?

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

How does the integrated flood sensor work, and what is needed to activate its alert features?

The integrated flood sensor uses SentryPlus Alert® technology to detect excessive water discharges from the relief valve. To activate its alert features and relay notifications, an add-on sensor connection kit is required.

What installation orientation is approved for this 4-inch backflow assembly?

This 4-inch Watts backflow assembly is approved for horizontal Z-pattern installation. It is crucial to install it in accordance with the direction of the flow arrow to ensure proper function.

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