DOUBLE-ACTING DISPLACEMENT PUMP Russian patent published in 2002 - IPC

FIELD: pump engineering for food, chemical, and pharmaceutical industries. SUBSTANCE: pump designed for handling primarily viscous and pasty materials has channels in its piston symmetrical relative to its center. Piston rod is coupled with piston through self-aligning sleeve permitting their relative radial and angular displacement in the form of two relatively perpendicular cylindrical axles of which first one is rigidly joined with piston and enters bore of second axle over its periphery. Second axle enters rod bore perpendicular to its longitudinal axis. Clearances provided between rod, second axle, and piston provide for radial and angular displacement between rod and piston. EFFECT: reduced unwanted resistance forces, facilitated delivery control. 5 dwg