4 M400N-NRS

Item Number: 0191098
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$12,241.51
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When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Ames
  • Reduced Pressure Zone Backflow Preventer Assembly
  • Weight: 311.0 lb
  • Nominal Size: 4 inch
  • Housing Material: 304 (Schedule 40) Stainless Steel
  • Shutoff Valves: Non-Rising Stem (NRS)
  • Check Modules: Torsion Spring Link Check
  • Installation Orientation: Horizontal N Pattern
  • Design: 70% lighter than traditional designs
  • Connections: Groove Couplings

Description

This 4-inch Maxim Reduced Pressure Zone Backflow Preventer Assembly (M400N-NRS) is designed for horizontal N pattern installation to prevent reverse flow of fire protection and non-potable water into the potable supply. Constructed with a durable 304 stainless steel housing and sleeve, it features Non-Rising Stem (NRS) shutoff valves and torsion spring Link Check Modules for low pressure loss and easy maintenance. The compact design is approximately 70% lighter than traditional models, facilitating smaller enclosures and easier handling. Groove couplings ensure straightforward installation. Item number 0191098.

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Installation Considerations

  • The assembly connects using groove couplings for ease of installation and proper pipe alignment.
  • Approved for horizontal N pattern installation; ensure the assembly is oriented according to the direction of flow arrow.
  • Requires adequate clearance around the valve for inspection, testing, and servicing, with a 12 inch minimum clearance below the assembly.
  • The valve must be protected from freezing.
  • Accommodate normal discharge and nuisance spitting with an Ames air gap fitting and a fabricated indirect waste line, ensuring floor drains of the same size are provided for excessive discharge.
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Additional Details

This 4 inch Maxim reduced pressure zone backflow preventer assembly is designed to prevent the reverse flow of fire protection substances and non-potable water into the potable water supply. It protects against backsiphonage and backpressure in accordance with national plumbing codes and water authority requirements, making it ideal for continuous pressure piping and health hazard cross-connections.

Key Features

  • Features a 304 (Schedule 40) stainless steel housing and sleeve for durability.
  • Extremely compact design, up to 70 percent lighter than traditional designs, allowing for smaller enclosures.
  • Equipped with NRS (Non-Rising Stem) shutoff valves and Link Check Modules for lowest pressure loss and ease of serviceability.
  • Includes replaceable check disc rubber, drip tight shutoff valves, and a bottom mounted stainless steel relief valve.
  • Designed for horizontal N pattern installation with groove couplings for easy setup and pipe alignment.

NOTICE: This information is not a substitute for full product installation and safety instructions. You must thoroughly read all instructions before installation.

Specifications

  • Product Type: Reduced Pressure Zone Backflow Preventer Assembly
  • Brand: Maxim / Ames Fire & Waterworks
  • SKU: 0191098
  • Nominal Size: 4 inch (DN100)
  • Housing Material: 304 (Schedule 40) Stainless Steel
  • Sleeve Material: 304 (Schedule 40) Stainless Steel
  • Shutoff Valves: Non-Rising Stem (NRS) Gate Valves
  • Check Modules: Torsion Spring Link Check Modules
  • Relief Valve: Bottom Mounted Stainless Steel
  • Check Disc: Replaceable Rubber
  • Connections: Groove Couplings
  • Installation Orientation: Horizontal N Pattern
  • Design Characteristic: 70% lighter than traditional designs

Dimensions (4 inch / DN100)

  • Dimension A: 9 in (229 mm)
  • Dimension B: 4 1/2 in (114 mm)
  • Dimension C: 12 in (254 mm)
  • Dimension D: 14 3/4 in (375 mm)
  • Dimension E: 4 1/2 in (114 mm)
  • Dimension F: 4 1/4 in (108 mm)

Certificates & Approvals

  • Not specified in source material.

FAQs

What type of backflow preventer is this assembly?

This is a Maxim 4 inch Reduced Pressure Zone (RPZ) backflow preventer assembly, model M400N-NRS.

What is the primary purpose of this backflow preventer?

It is designed to prevent the reverse flow of fire protection substances and non-potable water from entering the potable water supply due to backsiphonage or backpressure, in accordance with national plumbing codes.

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

The assembly features a 304 (Schedule 40) stainless steel housing and sleeve, with a bottom mounted stainless steel relief valve. It includes replaceable check disc rubber.

What type of shutoff valves are included with this assembly?

The assembly comes with Non-Rising Stem (NRS) gate valves, which are designed for drip-tight shutoff.

How does this backflow preventer connect to piping?

It utilizes groove couplings, which are designed for easy installation and proper pipe alignment.

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