Approved for fire protection, waterworks, plumbing, and irrigation
Dual-action check modules for low and high flow
OS&Y gate valves with tamper switch groove
Maximum working pressure: 175 psi
Temperature range: 33°F - 140°F
Bypass includes GPM meter for monitoring
Description
The 4 inch Ames Deringer 30G Double Check Detector Valve Assembly (DCDA-II) is a lead-free backflow preventer designed to protect potable water systems from non-health hazard pollutants due to backpressure or backsiphonage. Ideal for fire sprinkler systems, it features a stainless steel body, inline OS&Y gate valves with supervisory switches, and patented Dual-action™ check modules for optimal performance at both low and high flow rates. A GPM bypass meter allows for precise monitoring of water usage. Approved for fire protection, waterworks, plumbing, and irrigation applications, this assembly operates up to 175 psi and is serviceable in horizontal or vertical installations. Item number D-4030G-GPM.
Help Me Connect
Connections
The 4 inch Ames Deringer 30G DCDA-II features flanged ends that conform to ANSI B16.1 Class 125 for connection to compatible piping systems.
It also includes flexible groove couplings UL/FM between the body and gate valves for ease of installation and maintenance.
The 4 inch Ames Deringer™ 30G Double Check Detector Valve Assembly (DCDA-II) is designed to prevent non-health hazard pollutants from entering a potable water supply system. It is primarily used on fire sprinkler systems for monitoring unauthorized water usage.
Design & Operation
Patented Dual-action™ check modules operate as a poppet style check under low flow conditions and a swing style check under high flow.
Assembly is approved for both horizontal and vertical applications.
Tamper-resistant test cocks operate via a tamper resistant actuator.
Single full access service port with an "inline" replaceable elastomer cover seal.
Assembly is serviceable without special tools.
Valves & Connections
Includes two resiliently seated and inline serviceable AWWA C509 OS&Y gate valves.
Gate valves feature a stainless steel stem with pre-machined groove for supervisory tamper switch installation.
Flanged end ANSI B16.1 Class125.
Flexible groove coupling UL/FM between body and gate valves.
Bypass & Monitoring
Lead Free* bronze bypass components.
Bypass assembly includes a GPM bypass meter and a single check valve.
Stem includes tamper switch groove for supervisory switches.
Specifications
Valve Housing Material: 304 Stainless Steel
Valve Cover Material: 304 Stainless Steel
Assembly Body Material: 304 Stainless Steel
Dual-action Check Module: Yes
Bypass Meter: GPM
Approved Applications: Fire Protection, Waterworks, Plumbing, Irrigation
Installation: Horizontal and Vertical
Pressure & Temperature
Working Pressure: 10-175 psi
Temperature Range: 33°F - 140°F
Internal Materials
SOV Disks: EPDM/304SS
SOV Shafts: 304 Stainless Steel
Bypass Spring: 302 Stainless Steel
SOV Bearings: PTFE/Bronze
Non-wetted Bolts: Grade 8 Zinc Plated
Check Disks Material: Silicone (NSF)
Wetted Fasteners: 18-8 Stainless Steel
Bypass Components Material: Lead Free Bronze
Check Springs: 17-7 Stainless Steel
Check Pins: 17-7/18-8 Stainless Steel
Check Seats: Noryl® Polymer (NSF)
O-rings: Buna-N (NSF)
Bypass Internals: ABS Polymer (NSF)
Certificates & Approvals
AWWA C510-07 Compliant
ASSE 1047
UL Certified
FM Approved
Lead Free
FAQs
What is the primary function of the Deringer 30G DCDA-II?
It prevents non-health hazard pollutants from entering a potable water supply system due to backpressure or backsiphonage conditions. This ensures the safety of the potable water supply.
Where is this backflow preventer typically installed?
It is primarily used on fire sprinkler systems to monitor unauthorized water usage. It is also approved for general waterworks, plumbing, and irrigation applications.
What are the main connection types for this 4 inch assembly?
The assembly features flanged ends that conform to ANSI B16.1 Class 125 for connection to compatible piping systems. It also includes flexible groove couplings UL/FM between the body and gate valves for ease of installation.
What type of bypass meter does this model include?
This Deringer 30G DCDA-II model includes a GPM (Gallons Per Minute) bypass meter for accurate monitoring of water usage through the bypass line.
What is the maximum operating pressure and temperature for this device?
The assembly has a maximum working pressure of 175 psi. It is designed to operate within a temperature range of 33°F to 140°F.
