Patent ID: 7600533
Filing Date: 2009-10-13
Classification: F16K,Y10T

Abstract:
1. A micro check valve for controlling flow of a fluid, comprising: a multi-level valve seat comprised of a substrate material, the multi-level valve seat having a first surface at a first level and a second surface at a second, lower level; a valve cap disposed on the first surface, a space being defined between the valve seat and the valve cap; and a floating member movable in the space between the multi-level valve seat and the valve cap by application of pressure on the floating member by a fluid to passively control flow of the fluid through the multi-level valve seat and the valve cap, wherein the multi-level valve seat, the valve cap and the floating member are configured to permit flow of the fluid when the fluid pressure is between a threshold pressure and a cut-off pressure and to stop flow of the fluid when the fluid pressure exceeds the cut-off pressure.