SUCTION PUMP OF DEEP-WELL PUMP Russian patent published in 2020 - IPC F04B53/10 F04B47/00 F16K15/04 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry, in particular to check valves of downhole pumps. Suction valve includes a casing attached from below to the cylinder, in the valve cavity of which above the saddle with the through hole and below the upper limit stop with holes there is a movable ball. Upper limiter is rigidly connected inside the valve cavity to the body. Below the seat there are annular upper and lower projections in the valve cavity of the housing, between which there is a concentrically installed nozzle movable in the longitudinal direction, directed upwards on the through hole of the seat. Outside nozzle along perimeter is equipped with annular belt with longitudinal channels arranged evenly along perimeter. Total area of all channels and nozzle is not less than that of seat through hole. Annular ring of nozzle is made with possibility of interaction at appropriate movement of nozzle with upper protrusion closing channels, and with lower ledge not overlapping channels. Weight and design of nozzle with belt are made so that movement upwards occurs at flow of liquid from below upwards, exceeding maximum efficiency of pump.

EFFECT: valve is simple and reliable due to small quantity of simple parts in manufacturing and maintenance, at that it allows destruction of valve clog by jet of high-speed liquid with carry-over of liquid flow to surface along production string.

1 cl, 1 dwg