The 3 inch Ames Deringer 20G Double Check Valve Assembly is designed to protect potable water systems from non-health hazard pollutants due to backpressure or backsiphonage. Featuring a durable 304 stainless steel body, this assembly includes patented Dual-action™ check modules for reliable performance across low and high flow conditions. It incorporates inline serviceable OS&Y gate valves with flexible groove couplings and flanged ANSI B16.1 Class 125 end connections. Approved for both horizontal and vertical installation, it is suitable for fire protection, waterworks, plumbing, and irrigation, with a maximum working pressure of 175 PSI. This lead-free device is AWWA C510-07, NSF/ANSI 372, UL, FM, ASSE 1015, and USC certified.
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Connections
The assembly features flanged end connections that comply with ANSI B16.1 Class 125 standards.
Internal connections between the body and gate valves utilize flexible groove couplings, which are UL/FM approved.
The Ames Deringer™ 20G Double Check Valve Assembly is designed to prevent non-health hazard pollutants from entering the potable water supply system caused by backpressure and/or backsiphonage conditions.
This 3 inch assembly features resiliently seated and inline OS&Y shutoff valves, a stainless steel body, and patented Dual-Action™ check modules for high performance at both low and high-flow rates. It is approved for continuous pressure service.
Features
Inline serviceable gate valves
Stainless steel housing
Tamper-resistant test cocks
Patented Dual-action™ check modules with poppet action at low flow and swing action at high flow
Silicone elastomer check discs
Stem includes pre-machined groove for supervisory tamper switch installation
Flexible groove coupling UL/FM (between body and gate valves)
Approved for horizontal and vertical applications
Specifications
Size: 3 inch
Model: 20G
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)
Connections
End Connections: Flanged ANSI B16.1 Class 125
Between Body and Gate Valves: Flexible groove coupling UL/FM
Certificates & Approvals
AWWA C510-07 Compliant
NSF/ANSI 372
UL Certified
FM Approved
ASSE 1015
USC Approved
LEAD FREE (wetted surface contains less than 0.25% of lead by weight)
FAQs
What is the primary purpose of the Deringer 20G Double Check Valve Assembly?
The Deringer 20G Double Check Valve Assembly is designed to prevent non-health hazard pollutants from contaminating the potable water supply system due to backpressure and/or backsiphonage conditions.
What are the key features of the check modules in this assembly?
The assembly utilizes patented Dual-action™ check modules that feature both poppet action for low flow and swing action for high flow. They use replaceable silicone elastomer sealing discs.
What type of shutoff valves are included with this assembly?
This assembly includes inline serviceable AWWA C509 resilient seated OS&Y (Outside Stem & Yoke) gate valves. These valves feature a stainless steel stem with a pre-machined groove for supervisory tamper switches.
What are the maximum operating pressure and temperature limits for this valve?
The maximum operating pressure for the Deringer 20G is 175 PSI. It is designed to operate within a temperature range of 33°F to 140°F.
What certifications and approvals does this product hold?
This product is AWWA C510-07 Compliant, NSF/ANSI 372 certified, UL Certified, FM Approved, ASSE 1015, and USC Approved. It is also Lead Free, with wetted surfaces containing less than 0.25% lead.
