Flood-Gate Automatic Backwater Valves Operation and Approvals - Backwater Valves and Traps Technical Data

FLOOD-GATE^® OPERATION AND APPROVALS
OPERATION The FLOOD-GATE® automatic backwater valve is designed to protect a building and its contents from damage due to a backup in the drainage system. The FLOOD-GATE® is intended for installation in the sanitary drain line connecting a building’s sanitary system with the local sanitary sewer system or septic tank. It can also be used in storm sewer applications.

OPERATION OF KNIFE GATE

Knife Gate open The trapped air in the expansion chamber creates an upward force on the counterweight plate of the diaphragm.	Knife Gate closing When pressure increases beyond 6” head/water, the plate is forced upward activating the closing of the knife gate.	Knife Gate closes off valve A 9” head/water (4” valve), 14” head/water (6” valve) is sufficient to raise the gate to its fully closed position.

Lacking any upward force, the gate is in the open position, which allows for unrestricted flow through a full port opening.

Approvals
   The FLOOD-GATE® Automatic Backwater Valve conforms to requirements per ASME A112.14.1 for Backwater Valves.

   IAPMO Listed, File No. 3758.

   The FLOOD-GATE® Automatic Backwater Valve has been approved for use in the following states: Illinois, Indiana, Kentucky, Michigan, Massachusetts, Ohio, West Virginia, and Wisconsin.