Inspecting, Testing Backflow Preventers Used in Fire Protection Systems

摘要

Backflow devices have a relatively long history with water-based fire protection systems. For many years, the separation between the stagnant water in a sprinkler system and a potable water supply was accomplished by a single check valve on the fire protection system's water supply line. However, in the 1970s, many water supply purveyors and the plumbing codes began requiring backflow prevention devices on those water supply lines.