SUCKER-ROD WELL PUMP SUCTION VALVE Russian patent published in 1994 - IPC

FIELD: mechanical engineering. SUBSTANCE: seat has an axial cylindrical liquid passing hole. A shutter guide shank has projections in the form of blades on the outer cylindrical surface, the blades are inclined to the generatrix of the cylindrical surface. The shutter is mounted in a body cavity for axial movement and engagement with the thrust surface of the body and the seat. When the valve is closed the shutter mates the cylindrical surface of the seat and has flexible and movable rings in the mating zone. The shutter has a through axial hole with destructible plug mounted on the side of the shank and extending into the body cavity. EFFECT: improved structure. 2 cl, 4 dwg