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Portland Water Bureau

From forest to faucet, we deliver the best drinking water in the world.

GENERAL INFORMATION: 503-823-7404

1120 SW Fifth Ave, Suite 600, Portland, OR 97204

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Double Check Detector Assembly

Double Check Detector Assembly used to prevent backflow.
 
The Double Check Detector Assembly (DCDA) is an outgrowth of the double check valve and is primarily utilized in fire line installations. Its purpose is to protect the potable water supply line from possible contamination or pollution from the fire system, backpressure from fire line booster pumps, stagnant "black water" that sits in fire lines over extended periods of time, the addition of non-potable water through outside fire district connections (FDCs), and the detection of any water use in the fire line due to fire line leakage or deliberate water theft. It consists of two spring loaded check valves, a by-pass assembly with water meter and double check valve, and two tightly closing OS & Y gate valves.

Diagram of an double check detector assembly:

Standardized Information for Double Check Detector Assemblies:
Refer to the Portland Water Bureau's Backflow Assembly Installation Requirements

Heartbleed Security Notice

A serious security vulnerability known as "Heartbleed" was recently discovered in OpenSSL, a popular software library commonly used by many websites on the internet to encrypt communication between a user's computer and a web server.

PortlandOregon.gov is NOT affected by this vulnerability as it does not use the OpenSSL software library. Please rest assured we are dedicated to protecting your security on this website.