PISTON PUMP Russian patent published in 1995 - IPC

FIELD: pump engineering. SUBSTANCE: housing is provided with an eccentric drive used for reciprocation of a piston. The piston is received in a valve bank to form a working chamber. The chamber is connected to the suction and delivery manifolds alterantly through the suction and delivery valve. A detachable cover is mounted at the end of the piston for arresting axial movement with respect to the piston provided with a shank of T-shaped cross-section. The cover is provided with inner ring groove from the side of the piston and groove, which starts from the side of the face, for passing the shank. The later groove forms a locking connection having guaranteed axial space between faces of the piston and cover after turning the cover by 90 deg. A magnitude of the space is determined by a relationship available. EFFECT: enhanced efficiency. 3 dwg