Valve Type: UL/FM Grooved Gear Operated Butterfly with Tamper Switch
Maximum Working Pressure: 175 psi
Temperature Range: 33°F - 140°F
Flood Sensor: SentryPlus Alert® Technology
Bypass Meter: Gallon per Minute
Installation: Horizontal N-Pattern
Description
The Watts 6 inch 957NRPDA Reduced Pressure Detector Assembly Backflow Preventer provides protection against back-siphonage and backpressure in health hazard applications. This compact and lightweight assembly features a 304 stainless steel housing, UL/FM approved grooved gear operated butterfly valves with tamper switches, and a gallon per minute meter. It includes a SentryPlus Alert® flood sensor on the relief valve to detect excessive water discharges, with connectivity options for remote monitoring. Approved for horizontal N-pattern installation, it is designed for ease of serviceability and reliable performance in fire protection systems. Item F111665.
This 6 inch Watts Series 957NRPDA Reduced Pressure Detector Assembly Backflow Preventer helps stop the reverse flow of liquids due to backpressure or backsiphonage, where a potential health hazard exists. It is designed for horizontal N pattern installation and includes UL and FM Approved grooved gear operated butterfly valves with tamper switches.
WARNING
It is illegal to use this product in any plumbing system providing water for human consumption, such as drinking or dishwashing, in the United States. Before installing, consult your local water authority, building, and plumbing codes.
Key Components
Features a 304 (Schedule 40) stainless steel housing and sleeve for durability and a compact design.
Includes two independent torsion spring check modules and a differential pressure relief valve located between and below the modules.
Fitted with UL Classified and FM Approved grooved gear operated butterfly valves with tamper switches for reliable shutoff.
Equipped with a bottom mounted cast stainless steel relief valve and test cocks.
A metered bypass is included to detect leakage or unauthorized water use from the fire sprinkler system.
Designed for N-pattern orientation.
Furnished with a gallon per minute meter.
Flood Detection System
Contains a flood sensor with SentryPlus Alert® technology on the relief valve to detect excessive water discharges.
When paired with an add-on sensor connection kit (sold separately), the sensor activates to relay alerts for potential flooding events.
Connection kit options include BMS, cellular communication, and the Sensor Control Monitor which enables integration with BAS via RS-485 Modbus or the Nexa® platform through Wi-Fi.
Design and Performance
Features an extremely compact design and is 70% lighter than traditional designs, allowing for smaller enclosures.
Groove fittings allow for integral pipeline adjustment.
Patented torsion spring check provides the lowest pressure loss.
Offers unmatched ease of serviceability with replaceable check disc rubber.
Approved by the Foundation for Cross-Connection Control and Hydraulic Research at The University of Southern California (FCCCHR-USC)
AWWA C511-97
ASSE 1047
CSA B64.4
UL Classified (**BFG & OSY Only)
FM Approved (**BFG & OSY Only)
FAQs
What is the primary function of the Watts 957NRPDA backflow preventer?
The primary function is to protect potable water systems from contamination due to back-siphonage or backpressure in applications where a potential health hazard exists, such as fire protection systems.
What is the maximum operating pressure and temperature range for this assembly?
This assembly has a maximum working pressure of 175 psi (12.1 bar) and operates within a temperature range of 33°F to 140°F (0.5°C to 60°C).
Does this backflow preventer include a flood sensor?
Yes, it includes a flood sensor with SentryPlus Alert® technology on the relief valve to detect excessive water discharges. An add-on connection kit is required to activate and integrate the sensor with communication systems.
What type of shutoff valves are included with this model?
This model is equipped with UL Classified and FM Approved grooved gear operated butterfly valves, which also feature a tamper switch for added security and monitoring.
What materials are used for the main housing and sleeve?
The main housing and sleeve are constructed from durable 304 (Schedule 40) stainless steel, contributing to the assembly's compact design and lighter weight compared to traditional models.
