Questions? 916-760-4524

4" MAGNUM 40G (RP)

The 4" Magnum 40G (RP) Reduced Pressure Backflow Valve prevents non-health hazard pollutants and hazardous contaminants from entering a potable water supply system when backpressure and/or backsiphonage conditions occur. This product is designed for irrigation, plumbing, & some waterworks applications. The valve includes inline servicealbe AWWA C509 gate valves of type non rising stem (NRS).

Approvals
This Product is NOT UL or FM Approved

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

MSRP:

$1,799.00

Pro Price:

$1,389.00


NEVER install an RP or RPDA in a location where any amount of discharge from the Relief Valve will cause property damage. For an indoor, pit, vault, mechanical room or enclosure installation of an RP or RPDA, an auxiliary drain (separate and independent of the Air Gap Assembly) is REQUIRED and MUST be properly sized for the Maximum Relief Valve Discharge Rate (see specifications below) corresponding to the system/supply pressure. Backflow Direct shall not be responsible for any damage caused by lack of auxiliary drain, location of auxiliary drain or undersized auxiliary drain. If the buyer is unwilling to meet this requirement please DO NOT purchase this product.



NEVER install an RP or RPDA in a location where any amount of discharge from the Relief Valve will cause property damage. For an indoor, pit, vault, mechanical room or enclosure installation of an RP or RPDA, an auxiliary drain (separate and independent of the Air Gap Assembly) is REQUIRED and MUST be properly sized for the Maximum Relief Valve Discharge Rate (see specifications below) corresponding to the system/supply pressure. Backflow Direct shall not be responsible for any damage caused by lack of auxiliary drain, location of auxiliary drain or undersized auxiliary drain. If the buyer is unwilling to meet this requirement please DO NOT purchase this product.

Magnum Reduced Pressure Backflow Preventer RP Title
Magnum Reduced Pressure Backflow Preventer RP Cutaway

The Magnum 40G(X) Reduced Pressure Backflow Prevention Valve prevents non-health hazard pollutants and hazardous contaminants from entering a potable water supply system when backpressure and/or backsiphonage conditions occur. This product is designed for the waterwork, plumbing, and irrigation markets only.

Magnum Reduced Pressure Backflow Preventer RP 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

Flow Performance

Magnum Reduced Pressure Backflow Preventer RP Flow Performance

Measures & Materials

Magnum Reduced Pressure Backflow Preventer RP Measures and Materials
Valve Housing:
304 Stainless Steel
Valve Cover:
304 Stainless Steel
SOV Disks:
EPDM/304SS
SOV Shafts:
304 Stainless Steel
RV Spring:
302 Stainless Steel
SOV Bearings:
Teflon/Bronze
Non Wetted Bolts:
Grade 8 Zinc Plated
Check Disks:
Silicone
Wetted Fasteners:
18-8 Stainless Steel
RV Housing:
304 Stainless Steel
Check Springs:
17-7 Stainless Steel
Check Pins:
17-7/18-8 Stainless Steel
Check Seats:
Noryl Polymer
O-Rings:
Buna-N
RV Hose:
Braided Stainless Steel Wire

Engineering & Specifications

The Magnum 40G(x) Reduced Pressure (RP) valve 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. 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. Valve assembly shall include two resiliently seated and inline serviceable AWWA C509 gate valves of type non rising stem (NRS). Both gate valves shall include a stainless steel stem. 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. Relief Valve shall operate using only static seals (zero dynamic/sliding seals). All wetted surface Relief Valve components shall be constructed of stainless steel. Assembly shall be serviceable without special tools.

 Maximum Relief Valve  Discharge Rates

Magnum RP Backflow Preventer Relief Valve Discharge Rate

Air Gap Assembly will capture and evacuate light water discharge from the Relief Valve caused by daily fluctuation in system/supply pressure. An Air Gap Assembly will NOT capture and evacuate the Maximum Relief Valve Discharge Rate caused by catastrophic valve or system failure. An auxiliary drain (separate and independent of the Air Gap Assembly) is REQUIRED and MUST be properly sized for the Maximum Relief Valve Discharge Rate. Backflow Direct shall not be responsible for any special, consequential or incidental damages, including without limitation, repair costs, lost profits, property damage, or any other costs resulting from labor charges, delays, vandalism, negligence, fouling caused by foreign material, adverse water conditions or any other circumstances, caused by lack of auxiliary drain, location of auxiliary drain or undersized auxiliary drain.

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

Top

True-Seal™ Check Modules

The True Seal Check Valve was designed to incorporate a poppet only motion during the check stroke and is used exclusively on the first check assembly on the Deringer RP and RPDA models and Magnum RP model. This design allows a more consistent pressure loss across the check valve which helps maintain a steady and continual closure of the Relief Valve.

  • 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 & Magnum 40/50 First Check Skewed
Deringer & magnum 40/50 Low Flow Poppet Action

Poppet Action

Features:

  • 100% of check stroke is that of a poppet check
  • Consistent static sealing
  • Excellent resistant to fouling
  • Reliable check closure
  • Stable flow characteristics at ALL flow rates

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
Skewed View
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.
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 Magnum 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.

Magnum Backflow Preventer Tamper Resistant Test Cocks

Relief  Valve

The Deringer 40/50 Relief Valve uses a stainless steel body, piston seal and stainless steel sensing line and has been designed to be the smallest and lightest Relief Valve in the industry. Unlike previous relief valve designs, the piston seal does not use the body of the relief valve to align itself properly when closing and opening and instead uses the guide pin on the piston. This will aid in making the Relief Valve resistant to build up and binding. All components of the relief valve are lead free and meet the SDWA requirements.

Relief Valve Image

DOWNLOADS

Top
Magnum 40 Specification sheet

Magnum Specification Sheets

The Magnum 40G(X) 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.

Download pdf button




Magnum Backflow Preventer Maintenance Instructions

Maintenance Instructions

The Magnum 40G Maintenance Instructions provide step by step procedures for maintaining a 2" - 4” Magnum 40G backflow preventer. A printable PDF document and video of these instructions are both available.

Download pdf button




Backflow Direct Product Warranty

Relief Valve Discharge Rates

This is a printable version of the relief valve discharge rates for Deringer and Magnum backflow preventors as well as information on the air gap assembly.

Download pdf button




Backflow Direct Warranty

Product Warranty

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

Download pdf button View Video Button


More Information
TItle Default Store View
WARNING: Cancer and Reproductive Harm - www.p65warnings.ca.gov     Copyright © 2018 BackFlowDirect LLC, All Rights Reserved.