The 8 inch Deringer 40 Reduced Pressure Zone Backflow Preventer Assembly prevents hazardous contaminants and non-health pollutants from entering potable water systems due to backpressure or backsiphonage. This 100% stainless steel unit features integral Eccentric-Seal butterfly shutoff valves for a short lay length and includes True-Seal and Dual-Action check modules for high-performance flow rates. A SentryPlus Alert flood sensor detects excessive relief valve discharges. It is rated for continuous pressure service with a maximum working pressure of 175 PSI and a temperature range of 33-140°F. Item number D-8040.
Help Me Connect
End Connections
This 8 inch backflow preventer is designed with IPS Groove connections suitable for steel pipe conforming to AWWA C606.
It is also compatible with flange adapters that meet ANSI B16.1 Class 125 standards.
This 8 inch Deringer™ 40 Reduced Pressure Zone Backflow Preventer Assembly is designed to prevent hazardous contaminants and non-health hazard pollutants from entering the potable water supply system caused by backpressure and/or backsiphonage conditions. It features integral butterfly shutoff valves and a flood sensor with SentryPlus Alert® technology.
The assembly may be installed under continuous pressure service.
Features
SentryPlus Alert® flood sensor to detect excessive water discharges from the relief valve
Integral Eccentric-Seal™ butterfly shutoff valves for shorter lay length
Integrated tamper switches for added security
True-Seal™ and Dual-Action™ check modules for high performance at low- and high-flow rates
Prewired supervisory switches
Tamper-resistant test cocks
100% stainless steel housing
Stainless steel braided wire sensing line
Balanced chamber relief valve requires no sliding seals
Popular action first check for reliable and quiet seating
Specifications
General
Nominal Size: 8 Inch
Model: 40
Maximum Working Pressure: 175 PSI
Minimum Working Pressure: 10 PSI
Temperature Range: 33°F - 140°F
Materials
Housing: 304 Stainless Steel
Valve Cover: 304 Stainless Steel
SOV Stems: EPON/Bronze
SOV Shafts: 302 Stainless Steel
SOV Spring: 302 Stainless Steel
SOV Bearings: PTFE, Polymer/Polymer/Bronze
Non-Wetted Bolts: Grade 8 Zinc Plated
Check Disks: Silicone (NSF)
Wetted Fasteners: 304 Stainless Steel
RV Housing: 304 Stainless Steel
Check Seats: 17-7 Stainless Steel
RV Seats: 17-7/19-4 Stainless Steel
Check Springs: Noryl® Polymer (NSF)
O-Rings: Buna-N (NSF)
RV Hose: Braided Stainless Steel Wire
Dimensions
Overall Length (L): 31.0 inches (787 mm)
Height (H): 21.1 inches (536 mm)
Width (W): 13.8 inches (351 mm)
Installation Height (Ht): 10.4 inches (264 mm)
Base Height (Hb): 10.7 inches (272 mm)
Inlet/Outlet Diameter (D): 1.8 inches (46 mm)
Weight: 145 lbs (66 kg)
Certificates & Approvals
AWWA C511-07 Compliant
ANSI/NSF/CAN 61
UL Certified Health Effects
UL Certified to ANSI/NSF/CAN 372
LEAD FREE
FM APPROVED
USC APPROVED
ASSE 1013
FAQs
What is the primary function of the Deringer 40 backflow preventer?
The primary function is to prevent hazardous contaminants and non-health hazard pollutants from entering the potable water supply system, protecting against both backpressure and backsiphonage conditions.
What is the maximum working pressure and temperature range for this 8 inch model?
This 8 inch backflow preventer has a maximum working pressure of 175 PSI and operates effectively within a temperature range of 33°F to 140°F.
Does this backflow preventer include a flood detection feature?
Yes, it features a SentryPlus Alert® flood sensor designed to detect excessive water discharges from the relief valve, with options for add-on sensor connection kits for alerts.
What type of shutoff valves are integrated into this assembly?
The assembly incorporates integral Eccentric-Seal™ butterfly shutoff valves, which contribute to a shorter lay length and are designed for reliable performance.
What type of end connections does the 8-inch Deringer 40 use?
This 8-inch model uses IPS Groove connections, which are designed for steel pipe conforming to AWWA C606. It is also compatible with ANSI B16.1 Class 125 flange adapters.
