DELIVERY VALVE ASSEMBLY OF SUCKER-ROD PUMP Russian patent published in 2000 - IPC

FIELD: pumping-jack driven devices for lifting liquid from wells. SUBSTANCE: seat and spring-loaded valve are mounted above pump cylinder. The latter is joined to seat below exit of separate annular grooves for passing seat liquid to common annular clearance between body and seat. Separate annular grooves in seat at exit to sealed surface are made in the form of continuous annular duct that divides seat wall through its thickness at sealing point into two equal-thickness parts. Inner surface of valve is made in the form of truncated cone gradually passing to inner diameter of seat. Outer surface of valve has longitudinal guide ribs designed to prevent wedging of valve during its crosswise vibrations and longitudinal movement. EFFECT: reduced cross-sectional dimension of valve assembly. 4 cl, 5 dwg