Patent ID: 6174232
Filing Date: 2001-01-16
Classification: F04D,H05K

Abstract:
A check valve for a fan having a rotary axis and a grid that is substantially perpendicular to the axis, comprising:a resilient substrate adapted to be mounted to the grid of the fan, the substrate having a center point, a radially inward region and a perimeter;a plurality of flaps formed in the substrate, each of the flaps being defined by a slit having a radial edge segment with inner and outer ends extending from the inward region of the substrate toward the perimeter, and an outer edge segment extending transversely from the outer end of the radial edge segment; and whereinthe valve moves to an open position due to air pressure from the fan wherein the flaps flex axially away from the grid, and a closed position when air pressure from the fan ceases wherein the flaps are adapted to lie flush on the grid of the fan to prevent reverse airflow through the fan.