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Resources

Here you will find a large selection of resources provided by backflow direct that will help you discern the correct installation and maintenance methods for many if not all of our products here. Each file present here centers around backflow prevention installation and the necessary steps needed to have the most optimal installation and ensure your new addition runs smoothly for years and years to come. If for whatever reason you don’t find the answer among these files, please don’t hesitate to give us a call as soon as possible. When it comes to backflow prevention installation, we want to be there for each and every one of our customers to ensure they’re projects are going smooth and steady. Browse our documents or give us a call today!

 

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Specification Sheets

Deringer Specification Sheets include information on valve characteristics, flow performance data, approval status and engineering specifications for all sizes.

Deringer 20 Specification Sheet

Deringer 20X Specification Sheet

Deringer 30 Specification Sheet

Deringer 30X Specification Sheet

Deringer 40 Specification Sheet

Deringer 40X Specification Sheet

Deringer 50 Specification Sheet

Deringer 50X Specification Sheet

Deringer 20G Specification Sheet

Deringer 20GX Specification Sheet

Deringer 30G Specification Sheet

Deringer 30GX Specification Sheet

Deringer 40G Specification Sheet

Deringer 40GX Specification Sheet

Deringer 50G Specification Sheet

Deringer 50GX Specification Sheet

Maintenance Instructions

Deringer Maintenance Instructions provide step by step procedures for maintaining your backflow preventer.

Deringer 20/30 2 to 4 inch Maintenance Instructions

Deringer 20/30 6 to 8 inch and 20X/30X 4 to 6 inch Maintenance Instructions

Deringer 40/50 2 to 4 inch Maintenance Instructions

Deringer 40/50 6 to 8 inch and 40X/50X 4 to 6 inch Maintenance Instructions

Deringer 20G/30G 2 to 4 inch Maintenance Instructions

Deringer 20G/30G 6 to 8 inch and 20X/30X 4 to 6 inch Maintenance Instructions

Deringer 40G/50G 2 to 4 inch Maintenance Instructions

Deringer 40G/50G 6 to 8 inch and 40GX/50GX 4 to 6 inch Maintenance Instructions

Maintenance Videos

Maintenance Video - 2 to 4" Deringer 20

Maintenance Video - 6 to 8" Deringer 20(X)

Maintenance Video - 2 to 4" Deringer 30

Maintenance Video - 4 to 8" Deringer 30(X)

Maintenance Video - 2 to 4" Deringer 40

Maintenance Video - 4 to 8" Deringer 40(X)

Maintenance Video - 2 to 4" Deringer 50

Maintenance Video - 6 to 8" Deringer 50(X)

Relief Valve Discharge Rates

Discharge rates for relief valves of RP and RPDA backflow assemblies including Deringer/Magnum 40/40G, 50/50G, 40X/40GX, 50X/50GX.

Deringer/Magnum RP/RPDA Relief Vale Discharge Rates

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.

Tamper Switch Instruction

Gear Box Wiring & Replacement Instructions

The Deringer Gear Box Wiring Installation Instructions provide step by step procedures for wiring the Deringer gear box for fire alarm protection.

Gear Box Wiring

Gear Box Replacement

Indicator Flag Adjustment

The Indicator Flag Adjustment Instructions provide a step by step procedure for aligning the flag to fully open and fully close on the backflow preventor gear box.

Indicator Flag Position

Bypass Testing Instructions

30-50 Bypass Testing

CAD File Downloads

BFD-2520-BIM-REVIT (zip)

BFD-3020-BIM-REVIT (zip)

BFD-4020-BIM-REVIT (zip)

BFD-6020X-BIM-REVIT (zip)

BFD-8020-BIM-REVIT (zip)

BFD-2530-BIM-REVIT (zip)

BFD-3030-BIM-REVIT (zip)

BFD-4030-BIM-REVIT (zip)

BFD-6030X-BIM-REVIT (zip)

BFD-8030-BIM-REVIT (zip)

BFD-2540-BIM-REVIT (zip)

BFD-3040-BIM-REVIT (zip)

BFD-4040-BIM-REVIT (zip)

BFD-8040-BIM-REVIT (zip)

BFD-6040X-BIM-REVIT (zip)

BFD-2550-BIM-REVIT (zip)

BFD-3050-BIM-REVIT (zip)

BFD-4050-BIM-REVIT (zip)

BFD-8050-BIM-REVIT (zip)

BFD-6050X-BIM-REVIT (zip)

Approvals

Certified Backflow Preventers

At Backflow Direct, we pride ourselves on providing durable, reliable, and lightweight certified backflow preventers suited for your fire protection applications, as well as replacement parts that are of the highest quality. This is evidenced by the many certifications our products have received from third-party certification organizations, such as Underwriters Laboratories (UL), Underwriters Laboratories Canada (ULC), the Foundation for Cross Connection (USC), Factory Mutual (FM), and the American Society Sanitary Engineers (ASSE). Our products are also NSF/ANSI 372 certified, which ensures that our products are lead-free.

We’ve worked hard for the many safety certifications and approvals our certified backflow preventers and replacement parts have received. UL approval, for example, ensures that our products have been field tested and are durable, reliable, and safe to use. To learn more about the specific certifications our products have, you can refer to the individual product’s specification sheets.

UL Underwriters Laboratories - Deringer Listed Models

Size DC Horizontal DC Vertical DCDA-II Horizontal DCDA-II Vertical RP RPDA-II
2-1/2" 20 20 30 30 40 50
3" 20 20 30 30 40 50
4" 20 20 30 30 40 50
6" 20x 20x 30x 30x 40x 50x
8" 20 20 30 30 40 50
Listed Fully Approved Click Here for Online Certification

 

ULC Underwriters Laboratories Canada - Deringer Listed Models

Size DC Horizontal DC Vertical DCDA-II Horizontal DCDA-II Vertical RP RPDA-II
2-1/2" 20 20 30 30 40 50
3" 20 20 30 30 40 50
4" 20 20 30 30 40 50
6" 20x 20x 30x 30x 40x 50x
8" 20 20 30 30 40 50
Listed Fully Approved Click Here for Online Certification

 

FM Factory Mutual - Deringer Approved Models

Size DC Horizontal DC Vertical DCDA-II Horizontal DCDA-II Vertical RP RPDA-II
2-1/2" 20 20 30 30 40 50
3" 20 20 30 30 40 50
4" 20 20 30 30 40 50
6" 20x 20x 30x 30x 40x 50x
8" 20 20 30 30 40 50
Approved Fully Approved Click Here for Online Certification

 

USC Foundation for Cross Connection - Deringer Approved Models

Size DC Horizontal DC Vertical DCDA-II Horizontal DCDA-II Vertical RP RPDA-II
2-1/2" 20 20 30 30 40 50
3" 20 20 30 30 40 50
4" 20 20 30 30 40 50
6" 20x 20x 30x 30x 40x 50x
8" 20 20 30 30 40 50
Approved Fully Approved Click Here for Online Listings
Approved Fully Approved Click Here for Actual Certification

 

ASSE American Society Sanitary Engineers - Deringer Listed Models

Size DC Horizontal DC Vertical DCDA-II Horizontal DCDA-II Vertical RP RPDA-II
2-1/2" 20 20 30 30 40 50 Evaluation Complete
3" 20 20 30 30 40 50 Evaluation Complete
4" 20 20 30 30 40 50 Evaluation Complete
6" 20x 20x 30x 30x 40x 50x Evaluation Complete
8" 20 20 30 30 40 50 Evaluation Complete
Evaluation Complete All laboratory evaluation has been successfully completed and final documentation/certification is in process.
Listed Fully Approved Click Here for Certification

 

NSF/ANSI 372 Lead Free Certification - Deringer Certified Models

Size DC Horizontal DC Vertical DCDA-II Horizontal DCDA-II Vertical RP RPDA-II
2-1/2" 20 20 30 30 40 50
3" 20 20 30 30 40 50
4" 20 20 30 30 40 50
6" 20x 20x 30x 30x 40x 50x
8" 20 20 30 30 40 50
Certified The wetted surface of this product, contacted by consumable water, contains less than 0.25% lead by weight. Per Safe Drinking Water Act 1-4-14 Requirements. Certified by Underwriters Laboratories (UL). Fully Approved Click Here for Online Certification

 

SS705 Shut-off Valve

Size UL 1091 FM 1112 USC 10th Edition
2-1/2" Listed Approved Evaluation in Process
3" Listed Approved Evaluation in Process
4" Listed Approved Evaluation in Process
6" Listed Approved Evaluation in Process
8" Listed Approved Evaluation in Process
Evaluation In Process Product is currently undergoing laboratory evaluation.
Evaluation Complete All laboratory evaluation has been successfully completed and final documentation/certification is in process.
FM Approved Fully Approved Click Here for Online Certification
UL Listed Fully Approved Click Here for Online Certification

 

CAL FIRE MARSHAL

Click Here for Cal Fire Marshal Certification