Patent ID: 7666066

Claim:
A method of injecting solid particles into a pressurized fluid stream comprising: (a) providing a housing having a pressure chamber with an inlet adapted for connection to a source of pressurized fluid, and having a discharge outlet, and a separate particle inlet; (b) disposing a generally spherical member in the housing for rotation with respect thereto about an axis and disposing a portion of the spherical member over the particle inlet; (c) forming a plurality of recesses in the surface of the spherical member and spacing the recesses circumferentially thereabout; (d) disposing a particle inlet in the housing on a side of the spherical member opposite the pressure chamber and communicating the particle inlet with the surface of the spherical member; (e) disposing a first annular seal between the surface of the spherical member and the pressure chamber particle inlet; and, (f) disposing a second annular seal between the surface of the spherical member and the housing particle inlet and venting the housing between the first and second annular seal.