A backflow prevention device is used to protect city water supplies from outside contamination or pollution. These devices allow water to flow in only one direction, protecting the water supply from contamination that an end user may cause. In an unprotected system water flows both in and out of a building without constraint. If there is a pressure drop in an unprotected system, contaminated water will be pulled backwards into that water system.
Hutchinson Mechanical Services examines and tests prevention devices, including various components such as double-check valves and reduced pressure zone devices to ensure proper function.