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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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Pressure Vacuum Breaker Assembly

The Pressure Vacuum Breaker Assembly (PVBA) is an outgrowth of the atmospheric vacuum breaker and evolved in response to a need to have an atmospheric vacuum breaker that could be utilized under constant pressure and was testable. These assemblies may be used under constant pressure but do not protect against backpressure conditions. The assembly must be at least 12 inches higher than any downstream piping.

A diagram of a pressure vacuum breaker is illustrated below along with typical installation drawings:



 
Standardized Information for Pressure Vacuum Breakers:

Installation type:  Above ground
Safe to inject chemicals into system?  No
Okay to locate control valves downstream?  Yes
Okay to locate backpressure source downstream of assembly?  No
Installation height in relation to highest downstream piping:  12 inches above ground
Number of assemblies required: One per system
Use only with irrigation sprinkler heads?  Yes
Testing required after installation: annually
Testing required after repairing or moving assembly? Yes
Cost:  Varies

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.