PUMP UNIT Russian patent published in 2001 - IPC

FIELD: oil production. SUBSTANCE: given pump unit is designed to operate in mix of equipment pumping fluids from wells. It has body with two spaces housing bellows. Hydraulic driven pump is connected to pressure and drain lines of distributor with reversing mechanism mounted in body. Two conduits with suction and pressure valves are taken to each space. Spaces of bellows are connected by means of lines to distributor. Reversing mechanism of distributor is manufactured in the form of two rods with protrusions on ends linked to mobile part of distributor. Each protrusion is located in space of one of bellows and can interact with proper rest anchored in space of bellows on its mobile part. EFFECT: increased productivity, prolonged service life. 1 dwg