Patent ID: 8413954

Claim:
A control valve for use with a material delivery system to meter a particulate stream comprising: a. a convex spherical surface with its upper and lower portions removed; b. a cylindrical extension ascending from said spherical surface; c. a mounting collar integral to said cylindrical extension; d. a common cylindrical interior passage through said spherical surface, cylindrical extension and mounting collar; e. arcuate opposing lids of a spherical shape, having leading surfaces, said lids being hinged to said spherical surface, and said lids further comprising an interior concave surface of slightly larger radius than the radius of said spherical surface to provide a close tolerance, non-touching relationship with said spherical surface; f. a pair of female clevises each being attached to said lids; g. a pair of male devises in communication with said female clevises; h. a clevis pin to secure said female and male devises in position; and i. an overlapping band of a spherical shape, comprising a slightly larger radius than the radius of the lids located on one of said lids to create a recessed area for reception of said leading surface of the other said lid whereby said lids when activated by external means, provide a barrier effect with said spherical surface to prevent the loss of said particulate at all times during the opening and closing of said lids and an intermittent seal at said leading surfaces of said lids when said lids are in the closed position.