Abstract: A valve or ball reversal orifice provides provide a first flow restriction to a material flowing through the ball reversal orifice and a second flow restriction when the material reverses flow direction. The valve includes a housing having at least first and second walls that define a cavity therein. The cavity is configured such that a cross-sectional area of the cavity taken perpendicular to a longitudinal axis of the cavity decreases from the second wall to the first wall. A first port is provided in the first wall for allowing material to enter or exit a cavity, and a second port is provided in the second wall for allowing material to enter or exit the cavity. A flow restrictor, such as a ball, disposed in the cavity and is movable between a relatively large portion of said cavity and a relatively small portion of said cavity to provide different flow restriction depending on the direction of material flow through the cavity.

Abstract: A valve or ball reversal orifice provides provide a first flow restriction to a material flowing through the ball reversal orifice and a second flow restriction when the material reverses flow direction. The valve includes a housing having at least first and second walls that define a cavity therein. The cavity is configured such that a cross-sectional area of the cavity taken perpendicular to a longitudinal axis of the cavity decreases from the second wall to the first wall. A first port is provided in the first wall for allowing material to enter or exit a cavity, and a second port is provided in the second wall for allowing material to enter or exit the cavity. A flow restrictor, such as a ball, disposed in the cavity and is movable between a relatively large portion of said cavity and a relatively small portion of said cavity to provide different flow restriction depending on the direction of material flow through the cavity.