2 1/2 DERINGER 50G GPM

Item Number: D-2550G-GPM
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$4,178.54
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Deringer
  • Size: 2 1/2 inch
  • Maximum Working Pressure: 175 psi
  • End Connections: Flanged ANSI B16.1 Class 125
  • Housing Material: 304 Stainless Steel
  • Check Module: Dual-action (poppet/swing)
  • Bypass Meter: GPM (Gallons Per Minute)
  • Flood Sensor: SentryPlus Alert® Technology
  • Approvals: AWWA C511-07, NSF/ANSI 372, UL Certified, FM Approved, ASSE 1047-2021, USC Approved, Lead Free

Description

The Ames Deringer 50G Reduced Pressure Detector Assembly is a 2 1/2 inch Lead Free backflow preventer. It is designed to safeguard potable water systems from hazardous contaminants and pollutants caused by backpressure or backsiphonage, commonly used in fire sprinkler systems for monitoring unauthorized water usage. Key features include a durable 304 stainless steel housing, inline serviceable OS&Y gate valves, and a dual-action check module for reliable performance at both low and high flow rates. This assembly also integrates a GPM bypass meter and SentryPlus Alert® flood sensor technology. It is rated for a maximum working pressure of 175 psi and is approved by AWWA, NSF/ANSI, UL, FM, and ASSE. Item number D-2550G-GPM.

Help Me Connect

This 2 1/2 inch Reduced Pressure Detector Assembly features flanged ends conforming to ANSI B16.1 Class 125 standards, designed for secure bolt-on connections to corresponding flanged piping. The internal components, specifically between the body and gate valves, utilize flexible groove couplings that are UL Classified and FM Approved.

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Additional Details

The Ames Deringer™ 50G Reduced Pressure Detector Assembly is a 2 1/2 inch backflow preventer designed to protect potable water supply systems from hazardous contaminants and non-health hazard pollutants caused by backpressure and/or backsiphonage conditions. This assembly is primarily used on fire sprinkler systems to monitor unauthorized water use.

Features and Benefits

  • Equipped with resiliently seated and inline OS&Y shutoff valves featuring stainless steel stems and prewired supervisory switches.
  • Features a Dual-action™ check module (poppet action at low flow, swing action at high flow) for superior performance across flow rates.
  • Includes a gallons (GPM) bypass meter to detect and monitor unauthorized water usage.
  • Incorporates a flood sensor with SentryPlus Alert® technology to detect excessive water discharges from the relief valve, with add-on sensor connection kits available for BMS and cellular communications.
  • Constructed with a stainless steel body and Lead Free* bronze bypass components (wetted surface < 0.25% lead).
  • Designed with tamper-resistant test cocks and a balanced chamber relief valve without sliding seals.
  • Approved for Fire Protection, Waterworks, Plumbing, and Irrigation applications.

Important: The information contained herein is not intended to replace the full product installation and safety information available or the experience of a trained product installer. You are required to thoroughly read all installation instructions and product safety information before beginning the installation of this product.

Specifications

General

  • Product Type: Reduced Pressure Detector Backflow Preventer Assembly
  • Model: Deringer™ 50G
  • Size: 2 1/2 inch
  • Bypass Meter: GPM (Gallons Per Minute)
  • End Connections: Flanged ANSI B16.1 Class 125
  • Dual-Action Check Module: Poppet action (low flow), Swing action (high flow)
  • Gate Valves: OS&Y (Outside Stem & Yoke), Resilient Seated, Inline Serviceable
  • Supervisory Switches: Prewired
  • Flood Sensor: SentryPlus Alert® Technology
  • Temperature Range: 33°F - 140°F
  • Maximum Working Pressure: 175 psi (12 bar)

Materials

  • Valve Housing: 304 Stainless Steel
  • Valve Cover: 304 Stainless Steel
  • SOV Disks: EPDM/304SS
  • SOV Shafts: 304 Stainless Steel
  • Bypass Spring: 304 Stainless Steel
  • RV Spring: 302 Stainless Steel
  • SOV Bearings: PTFE Fluoropolymer/Bronze
  • Non-wetted Bolts: Grade 8 Zinc Plated
  • Check Disks: Silicone (NSF)
  • Wetted Fasteners: 18-8 Stainless Steel
  • Bypass Components: Lead Free Bronze
  • RV Housing: 304 Stainless Steel
  • Check Springs: 17-7 Stainless Steel
  • Check Pins: 17-7/18-8 Stainless Steel
  • Check Seats: Noryl® Polymer (NSF)
  • O-rings: Buna-N (NSF)
  • Bypass Internals: ABS Polymer (NSF)
  • RV House: Braided Stainless Steel Wire

Dimensions (2 1/2 inch)

  • Height (Ht): 19.0 in (483 mm)
  • Base to Top of Handle (Ht+Hb): 28.3 in (719 mm)
  • Length (L): 31.9 in (810 mm)
  • Width (W): 12.6 in (320 mm)
  • Weight: 132 lb (60 kg)

Certificates & Approvals

  • AWWA C511-07 Compliant
  • NSF/ANSI 372
  • UL Certified
  • LEAD FREE (Wetted surface < 0.25% lead)
  • FM Approved
  • ASSE 1047-2021
  • USC Approved

FAQs

What is the primary purpose of the Ames Deringer 50G backflow preventer?

Its primary purpose is to prevent hazardous contaminants and non-health hazard pollutants from entering a potable water supply system due to backpressure or backsiphonage conditions. It is also used in fire sprinkler systems to monitor for unauthorized water use.

What are the main connection types for this 2 1/2 inch Deringer 50G assembly?

This assembly features flanged ends that conform to ANSI B16.1 Class 125 standards for connection to your piping system. Internally, flexible groove couplings are used between the body and gate valves.

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

The maximum working pressure for this unit is 175 psi (12 bar). It is designed to operate within a temperature range of 33°F to 140°F.

Does this backflow preventer include a bypass meter for water usage monitoring?

Yes, the Deringer 50G assembly includes a GPM (gallons per minute) bypass meter. This meter is specifically used to monitor for unauthorized water usage, particularly in fire sprinkler systems.

What safety features are included in this Deringer 50G assembly?

It features a flood sensor with SentryPlus Alert® technology to detect excessive water discharges from the relief valve, prewired supervisory switches on the OS&Y gate valves, and tamper-resistant test cocks to ensure system integrity.

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