The Principle Operation of a Dual Check Valve with Intermediate Atmospheric Vent – Backflow Prevention Device –Typical Installations
The DCVwIV is designed for continuous pressure and non-health hazard applications in smaller supply lines, such as laboratory equipment, food processing equipment, sterilizers, livestock drinking fountains, dairy equipment, and specifically for residential boiler feed lines with no chemical use. A DCVwIV is installed on the supply line to a hot water heating system to prevent the hot water in the hydronic heating system from flowing backwards through a boiler water feed line into the building water system. Boilers are pressurized vessels connected to the public water system. Anytime the potable water system drops below boiler pressure, backflow can occur.
