4 DERINGER 20G (DC)

Item Number: D-4020G
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$5,671.00
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Deringer
  • Size: 4 inch
  • Weight: 205.0 lb
  • Housing Material: 304 Stainless Steel
  • Maximum Working Pressure: 175 psi
  • Temperature Range: 33°F - 140°F
  • Lead Free: Yes (wetted surface < 0.25% lead)
  • Check Modules: Patented Dual-action™
  • Gate Valves: Inline serviceable OS&Y
  • Approved for Fire Protection, Waterworks, Plumbing, and Irrigation applications

Description

The 4 inch Ames Deringer™ 20G Double Check Valve Assembly is engineered to prevent non-health hazard pollutants from entering potable water systems due to backpressure or backsiphonage. It features a durable 304 stainless steel housing, inline serviceable OS&Y gate valves, and patented Dual-action™ check modules for reliable performance across low and high flow rates. This lead-free assembly operates within a 10-175 psi working pressure range and is approved for fire protection, waterworks, plumbing, and irrigation. Its flanged ANSI B16.1 Class 125 connections support installation in both horizontal and vertical orientations.
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Additional Details

This 4 inch Ames Deringer™ 20G 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. It features a robust 304 stainless steel body with inline serviceable OS&Y shutoff valves and patented Dual-action™ check modules for high performance at low and high flow rates.

Features

  • Inline serviceable gate valves
  • Stainless steel housing
  • Tamper-resistant test cocks
  • Patented Dual-action™ check modules:
    • Poppet action at low flow
    • Swing action at high flow
  • Silicone elastomer check discs
  • Stem includes tamper switch groove
  • AWWA C509/UL/FM resilient seated gate valves (OS&Y)
  • Flanged end ANSI B16.1 Class125
  • Flexible groove coupling UL/FM (between body and gate valves)

Design & Operation

  • Utilizes two independent Dual-action check modules contained within a single valve housing.
  • Check modules operate as a poppet style under low flow and swing style under high flow conditions.
  • Features replaceable silicone elastomer sealing discs.
  • Assembly includes two resiliently seated, inline serviceable AWWA C509 gate valves (OS&Y type) with stainless steel stems.
  • Gate valves include a stainless steel stem with pre-machined groove for supervisory tamper switch installation.
  • Test cocks are handle-less and operate via a tamper resistant actuator.
  • Single full access service port and cover with an inline replaceable elastomer cover seal.
  • Assembly is serviceable without special tools and approved for both horizontal and vertical applications.

Specifications

  • Size: 4 inch
  • Maximum Working Pressure: 175 psi
  • Minimum Working Pressure: 10 psi
  • Temperature Range: 33°F - 140°F

Materials

  • Valve Housing: 304 Stainless Steel
  • Valve Cover: 304 Stainless Steel
  • SOV Disks: EPDM/304SS
  • SOV Shafts: 304 Stainless Steel
  • SOV Bearings: Teflon® 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)

End Connections

  • Flange Connections: ANSI B16.1 Class 125
  • Lead Content: < 0.25% (wetted surface)

Certificates & Approvals

  • AWWA C510-07 Compliant
  • NSF/ANSI 372 Certified
  • UL Certified
  • FM Approved
  • ASSE 1015 Approved
  • USC Approved
  • Lead Free

Dimensions (4 inch Model)

  • Height (Ht): 22.5 in (572 mm)
  • Bottom to Center (Hb): 4.5 in (114 mm)
  • Length (L): 33.9 in (861 mm)
  • Total Height (Ht+Hb): 27.0 in (686 mm)
  • Width (W): 11.0 in (279 mm)
  • Weight: 160 lbs (73 kg)

FAQs

What is the primary purpose of the Deringer™ 20G Double Check Valve Assembly?

The primary purpose is to prevent non-health hazard pollutants from contaminating the potable water supply system due to backpressure or backsiphonage conditions.

What are the main materials used in the construction of this valve assembly?

The valve housing, valve cover, and SOV shafts are made from 304 stainless steel. Check discs are silicone (NSF), check seats are Noryl® Polymer (NSF), and O-rings are Buna-N (NSF).

What is the maximum working pressure and operating temperature range for this model?

This 4-inch assembly has a maximum working pressure of 175 psi and operates within a temperature range of 33°F to 140°F.

Are the gate valves included with the assembly serviceable?

Yes, the assembly includes two resiliently seated and inline serviceable AWWA C509 OS&Y gate valves. They are designed for full access service and can be maintained without special tools.

What kind of connections does this Deringer™ 20G model use?

This model features flanged end connections that comply with ANSI B16.1 Class 125. It also includes flexible groove couplings (UL/FM approved) between the body and gate valves.

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