3 DERINGER 20 (DC)

Item Number: D-3020
1 1
$2,666.77
In Stock (10)
Estimated transit time: 2 to 5 Business Days Eligible for Express Shipping

Brand - Deringer
  • Size: 3 inch
  • Weight: 48.0 lb
  • Housing Material: 100% 304 Stainless Steel
  • Maximum Working Pressure: 175 psi
  • Dual-action™ check modules for low and high flow
  • Integral Eccentric-Seal™ butterfly shutoff valves
  • Prewired supervisory tamper switches included
  • End Connections: IPS Grooved Ends
  • Lead Free compliant: Wetted surface < 0.25% lead

Description

The 3 inch Ames Deringer™ 20 Double Check Valve Backflow Preventer Assembly is designed to prevent non-health hazard pollutants from entering potable water systems due to backpressure or backsiphonage. This lead-free device features a durable 100% stainless steel housing and integral Eccentric-Seal™ butterfly shutoff valves for a short lay length. Dual-action™ check modules ensure high performance across low and high flow rates. It includes prewired supervisory tamper switches and tamper-resistant test cocks, with IPS grooved ends for connection versatility. Rated for 175 psi maximum working pressure and approved for horizontal or vertical installation, it meets AWWA, UL, FM, and ASSE standards.
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Additional Details

This 3 inch Ames Deringer™ 20 double check valve backflow preventer assembly is designed to prevent non-health hazard pollutants from entering the potable water supply system caused by backpressure and/or backsiphonage conditions.

Features

  • Integral Eccentric-Seal™ butterfly shutoff valves designed for shorter lay length and suitable for indoor or outdoor application
  • 100% stainless steel housing for durability
  • Tamper-resistant test cocks provide security
  • Patented Dual-action™ check modules offer high performance at both low and high flow rates (poppet action at low flow, swing action at high flow)
  • Silicone elastomer check discs for reliable sealing
  • Prewired supervisory tamper switches are integrated for convenience
  • IPS grooved ends and flange adapters available for versatile connections
  • Serviceable without special tools
  • Approved for both horizontal and vertical installation
  • May be installed under continuous pressure service

Materials

  • Valve Housing: 304 Stainless Steel
  • Valve Cover: 304 Stainless Steel
  • SOV Disks: EPDM/304SS
  • SOV Shafts: 304 Stainless Steel
  • SOV Bearings: PTFE Fluoropolymer/Bronze
  • Non-wetted Bolts: Grade 8 Zinc Plated
  • Check Disks: Silicone (NSF)
  • Wetted Fasteners: 18-8 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)

Specifications

  • Size: 3 inch
  • Housing Material: 304 Stainless Steel
  • Check Discs Material: Silicone (NSF)
  • O-rings Material: Buna-N (NSF)
  • Check Seats Material: Noryl® Polymer (NSF)
  • Maximum Working Pressure: 175 psi
  • Minimum Working Pressure: 10 psi
  • Temperature Range: 33°F - 140°F
  • End Connections: IPS Grooved Ends
  • Check Modules: Dual-action™
  • Housing Type: Single rigid valve housing
  • Lead Free: Yes (wetted surface < 0.25% lead by weight)
  • Weight: 40 lb
  • Length (L): 18.7 inch
  • Height (H): 10.3 inch
  • Width (W): 11.0 inch

Certificates & Approvals

  • AWWA C510-07 Compliant
  • ANSI/NSF/CAN 61
  • UL Certified Health Effects
  • UL Certified to ANSI/NSF/CAN 372
  • LEAD FREE
  • FM Approved
  • ASSE 1015
  • USC Approved

FAQs

What is the primary function of the 3 inch Deringer 20 Double Check Valve Assembly?

This assembly is designed to prevent non-health hazard pollutants from entering the potable water supply system. It protects against contamination caused by both backpressure and backsiphonage conditions.

What materials are used in the construction of the Deringer 20 housing?

The valve housing and cover are constructed entirely of 304 Stainless Steel. Internal components such as check discs and O-rings use silicone (NSF) and Buna-N (NSF) for reliable sealing.

What type of end connections does this 3 inch model support?

The 3 inch Deringer 20 is equipped with IPS grooved ends, which are suitable for steel pipe connections conforming to AWWA C606. It can also accommodate flange adapters that meet ANSI B16.1 Class 125 standards.

Is this backflow preventer suitable for potable water applications?

Yes, this product is LEAD FREE certified, meaning the wetted surface contains less than 0.25% lead by weight. It is UL Certified for Health Effects to ANSI/NSF/CAN 61 and 372, making it approved for potable water systems.

Can the Deringer 20 be installed in any orientation?

Yes, the Deringer 20 Double Check Valve Assembly is approved for both horizontal and vertical installation, offering flexibility for various piping configurations.

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