6" Deringer 20GX
Backflow Direct's 6" Deringer 20X Double Check DC DCA Backflow Preventer
 
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The 6" Deringer 20Gx Double Check with OS&Y gate valves prevents non-health hazard pollutants from entering a potable water supply system when backpressure and/or backsiphonage conditions occur. The Outside Yolk and Stem provide a visual indicator to whether the gate valves are in the open or closed position.
    The smallest,
    lightest,
    most economical,
    best performing,
    and only all stainless steel
    backflow preventer. Period.

Approved in the Horizontal & Vertical Up Position.

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

MSRP: $2,279.00
Pro Price: $1,899.00


Product Code: BFD-6020GX


Qty:
Specifications Technology Downloads
 

The Deringer 20G(x) Double Check Valve Assembly (DC) is designed to prevent non-health hazard pollutants from entering the potable water supply system caused by backpressure and/or backsiphonage conditions.

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

Measures & Materials

Valve Housing:
304 Stainless Steel
Valve Cover:
304 Stainless Steel
SOV Disks:
EPDM/304SS:
SOV Shafts:
304 Stainless Steel
SOV Bearings:
Teflon/Bronze
Non Wetted Bolts:
Grade 8 Zinc Plated
Check Disks:
Silicone
Wetted Fasteners:
18-8 Stainless Steel
Check Springs:
17-7 Stainless Steel
Check Pins:
17-7/18-8 Stainless Steel
Check Seats:
Noryl Polymer
O-Rings:
Buna-N

Engineering & Specifications

The Deringer 20G(x) Double Check Valve shall utilize two independent Dual Action Check modules contained within a single 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 outside yoke and stem (OS&Y). Both gate valves shall include a stainless steel stem with pre-machined groove for installation of supervisory tamper switches. 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 cover seal. Assembly shall be serviceable without special tools and approved for both horizontal and vertical applications.


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