ASSE Standard #1024-2017
Performance Requirements for Dual Check Backflow Preventers
ANSI Approved: January 2018
This standard applies to devices classified as dual check backflow preventers. The purpose of this device is to keep polluted water from flowing back into the potable water system when pressure is temporarily higher in the polluted part of the system than in the potable water piping. The devices covered by this standard are intended to protect the potable water supply from low hazard pollution at residential service lines and individual outlets.
Dual check backflow preventers consists of two (2) independently acting check valves, internally force loaded to a normally closed position, designed and constructed to operate under intermittent or continuous pressure conditions with cold water service. Usage with hot water is limited to the temperature specified by the manufacturer.
A downloadable version of this standard is also available.