SEAT-AND-BALL VALVE FOR WELL PUMP Russian patent published in 1999 - IPC

FIELD: well sucker-rod pumps for production of oil and oil-and-gas fluids from wells. SUBSTANCE: seat-and-ball valve of well pump includes body 1 with bore 2 which terminates in chamfer 3. Fitted inside body 1 is seat 4 with sockets 5 made on upper end of seat, ball 6 and guide device 7 made from wire in form of at least one half-frame whose shoulders are supported by chamfer 3 of bore 2, its ends being received by sockets 5 of seat 4. The entire assembly is secured by means of end-piece 8. EFFECT: considerably reduction of hydraulic resistance of fluid pumped out during its flowing from under-valve to above-valve cavity. 2 dwg