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3" Deringer 30

The 3" Deringer 30 Double Check Detector Assembly prevents non-health hazard pollutants from entering a potable water supply system when backpressure and/or backsiphonage conditions occur. Used primarily on fire sprinkler systems when monitoring of unauthorized water use is required.

The smallest, lightest, most economical, best performing, and only all stainless steel backflow preventer. Period.

Deringer DCDA-II Approvals
Approved in the Horizontal & Vertical Up Position.

Important Note: Install with FLEX Couplings or Flange Adapters Only. DO NOT use RIDGED Couplings!

MSRP:

$1,619.00

Pro Price:

$1,299.00
Deringer Double Check Detector Assembly Backflow Preventer DCDA-II Title
Deringer Double Check Detector Assembly Backflow Preventer DCDA-II Cutaway

The Deringer 30 Double Check Detector Assembly prevents non-health hazard pollutants from entering a potable water supply system when backpressure and/or backsiphonage conditions occur. Used primarily on fire sprinkler systems when monitoring of unauthorized water use is required.

Deringer Double Check Detector Assembly Backflow Preventer DCDA-II Approvals
Maximum Working Pressure:
175psi (12.1 bar)
Temperature Range:
33° - 140°F (1° - 60°C)
End Connections
- IPS Groove for Steel Pipe:
AWWA C606
- Flange Adapters:
ANSI B16.1 Class 125
Lead Free:
0.25% Maximum by Weight

Micro type-II  Bypass TM Assembly

The type-II bypass assembly is a new technology to the backflow industry and is used on Backflow Direct's Deringer 30 (DCDA-II).

As more manufacturers begin to utilize this technology it is only a matter of time before it’s widely used and is more commonly seen than the old type-I bypass assembly.

We created this video to provide a clear explanation on how the type-II bypass provides the EXACT same level of protection as a type-I bypass as well as some of the similarities and differences between the two.

Flow Performance

Deringer Double Check Detector Assembly Backflow Preventer DCDA-II Flow Performance

Measures &  Materials

Deringer Double Check Detector Assembly Backflow Preventer DCDA-II Measures and Materials
Valve Housing:
304 Stainless Steel
Valve Cover:
304 Stainless Steel
SOV Disks:
EPDM/304SS:
SOV Shafts:
304 Stainless Steel
Bypass Spring:
302 Stainless Steel
SOV Bearings:
Teflon/Bronze
Non Wetted Bolts:
Grade 8 Zinc Plated
Check Disks:
Silicone
Wetted Fasteners:
18-8 Stainless Steel
Bypass Components:
Lead Free Bronze
Check Springs:
17-7 Stainless Steel
Check Pins:
17-7/18-8 Stainless Steel
Check Seats:
Noryl Polymer
O-Rings:
Buna-N
Bypass Internals:
ABS Polymer

Engineering &  Specifications

The Deringer 30 Double Check Detector Assembly (DCDA-II) shall utilize two independent Dual Action Check modules and two integral resiliently seated shut-off valves all of which shall be contained within a single rigid valve housing constructed entirely of 304 stainless steel. Both integral shutoff valves shall include pre-wired supervisory tamper switches contained within a weatherproof actuator housing approved for both indoor and outdoor use. Dual Action Check modules shall operate as a “poppet style” check under low flow conditions, operate as a “swing style” check under high flow conditions and utilize replaceable silicone elastomer sealing discs. Assembly test cocks shall be handle-less and operate via a tamper resistant actuator. Assembly shall have a single full access service port and cover with an “inline” replaceable elastomer seal. All bypass assembly components shall be lead free and include a meter registering either gallons or cubic feet, a single check valve and required test cocks. Assembly shall be serviceable without special tools and approved for both horizontal and vertical applications.

Retrofit   Spool Program

The Backflow Direct Retrofit Program is the easiest spool ordering process in the industry!

Simply go to our online Retrofit Spool Form and submit a few pieces of needed information. Backflow Direct will take the information provided and create a CAD drawing of the completed retrofit package along with a quote for you to review.

When you are ready to order, simply confirm by email and BackFlow Direct will start your order. It really is THAT easy!

BackFlow Direct's retrofit program video provides an easy to understand demonstration of the ordering process from start to finish. Please feel free to contact us with any questions at sales@backflowdirect.com.

TECHNOLOGY

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Dual-Action™  Check Modules

The Patented Dual-Action Check™ (US8875733) is the core technology behind the superior performance of Deringer Backflow Prevention Product Line. The Dual-Action Check™ combines all of the best features of industry standard “poppet” checks and “swing” checks into a single high performance check module.

  • Light weight engineered polymer components.
  • Modular for easy removal of complete check from body.
  • Easily disconnect spring tension for safe check servicing.
  • Replaceable Silicone Rubber Elastomer Disk.
  • Excellent resistance to fouling
Deringer Dual Action Check Skewed View
Deringer Low Flow Poppet Action

Poppet Action

Features:

  • Initial 25% of check stroke is that of a poppet check.
  • Consistent static sealing
  • Excellent resistant to fouling
  • Reliable check closure
  • Stable flow characteristics at lower flow rates

Swing Action

Features:

  • Final 75% of check stroke is that of a swing check.
  • Minimal friction loss at high flow rates.
  • More linear flow path water through valve.
Deringer High Swing Action

Bow-Seal™  Full Access Cover

The Patented Bow-Seal™ Full Access Cover (US8844562) is pre-formed to cylindrical shape friendly to high fluid pressure. This allows the cover to be much thinner and lighter than traditional flat covers while still providing FULL and EASY access to Dual Action™ Check Modules.

Additional features include:

  • Light weight
  • Simple removal
  • No sliding seals
  • Full access to valve internals
  • No cumbersome and heavy couplings
Deringer Backflow Preventer Bow Seal Access Cover

Tamper Resistant  Test Cock

The Deringer tamper resistant ½” and ¾” ball valves are the first handle-less test cocks found on large diameter backflow devices in the industry. The top of the valve actuation stem has a unique shape that uses an independent custom wrench to open and close test cocks. All test cocks are lead free and meet the SDWA requirements.

Deringer Tamper Resistant Test Cocks

Micro-Bypass™  Assembly

The Deringer 30/50 Micro Bypass™ Assembly is a type II bypass that utilizes an angled check valve and includes a standard 5/8 X 3/4 water meter for water use detection. It is the shortest, lightest and smallest bypass in the industry and the same bypass is used on all size Deringer 30/50 models. Constructed of lead free bronze, the micro bypass assembly meets all SDWA lead free standards.

Deringer Mirco Bypass Assembly 2½ - 4

Bypass-Angled  Check Valve

The bypass angled check valve has many features shown in the graphic below that are fundamental to creating the shortest, lightest and smallest bypass in the industry.

Deringer Bypass Angled Check Valve Image

DOWNLOADS

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Deringer Specification Sheets

The Deringer 30 Specification Sheet includes information on valve characteristics, flow performance data, approval status and engineering specifications for all sizes. This file can be downloaded as a PDF and saved for future use.

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Tamper Switch Instructions

Maintenance   Instructions

The Deringer 20/30 Maintenance Instructions provide step by step procedures for maintaining a 2" - 4” Deringer 20/30 backflow preventer. A printable PDF document and video of these instructions are both available.

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Tamper Switch Instructions

Tamper Switch   Procedure

The Deringer Gear Box Tamper Switch Procedure provides a step by step instructions for positioning the wiring of the Deringer gear box for fire alarm protection. A printable PDF document of these instructions is available.

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Gear Box Wiring Instructions

Gear Box Wiring Instructions

The Deringer Gear Box Wiring Installation Instructions provide step by step procedures for wiring the Deringer gear box for fire alarm protection. A printable PDF document of these instructions is available.

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Indicator Flag Adjustment Instructions

Indicator Flag   Adjustment

The Indicator Flag Adjustment Instructions provides a step by step procedure for aligning the flag to fully open and fully close on the backflow preventor gear box. A printable PDF document of these instructions is available.

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Backflow Direct Warranty

Product  Warranty

This printable document provides information for the Backflow Direct one year warranty for Deringer and Magnum backflow preventers.

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