AWWA Approved Backflow Tester
ABPA Approved Backflow Tester

Serving the Greater Los Angeles Area

Dec 11, 2018


Different Backflow Devices

If you have backflow repair that needs to be performed, there are a number of systems that can be used to prevent further backflow issues. Below is a list of various types of backflow valves and their qualities.

Air Gap • Maintains a physical separation between potable water and non potable water systems • The gap must be maintained at all times and must be a minimum of two times the diameter of the supply pipe

Atmospheric Vacuum Breaker (AVB) • Designed to prevent back-siphonage but will not protect against backpressure • One must be installed for each irrigation zone directly after the control valve • No valves can be installed downstream of the AVB • Must be installed at least 6”above the highest point of water in the zone it serves

Pressure Vacuum Breaker Assembly (PVB) • Effective against back-siphonage but not against back pressure. • Must be installed a minimum of 12 inches above the highest point of water they serve • There can be no pumps or backpressure on the downstream side • Should not be used in a system that introduces chemicals and fertilizers

Double Check Valve Assembly (DCA) • Protects against both backpressure and back-siphonage • Control valves can be located downstream • Should not be used in a system that introduces chemicals and fertilizers

Reduced Pressure Backflow Assembly (RPBA) • Protects against backpressure and back-siphonage • Only one RPBA is required to serve the whole system • Is installed upstream of all control valves • Must be installed a minimum of 12 inches above ground level

No matter what type of backflow prevention assembly you use, it should have a backflow test performed on a regular basis. Having a backflow prevention test performed regularly helps ensure that the device is working properly

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