PUMP UNIT FOR DELIVERING FIXING MORTAR Russian patent published in 1995 - IPC

FIELD: positive- displacement hydraulic machines. SUBSTANCE: piston with double-sided rod and having mean for sealing is received in a driving air-operated cylinder with face covers. Working cylinders are mounted coaxially to the air- operated cylinder at its faces and coupled with the covers. The pump piston is movably mounted in each cylinder. The piston is connected with corresponding end of the rod of the air-operated cylinder and can move along the axis with respect to the rod. Each suction and delivery valve has a gate-seat pair. The covers of the air-operated cylinder are provided with axial bores. The working cylinders are coupled with the covers through intermediate sleeves which are received in the bores and have openings in the bottom for receiving the rod and the mean for its sealing. EFFECT: enhanced efficiency. 5 cl, 3 dwg