RETURN VALVE Russian patent published in 2018 - IPC E21B34/06 E21B21/10 F16K15/02 

FIELD: machine engineering.

SUBSTANCE: valve comprises a body with a central threaded hole, the body includes a cage, a seat and a spring-loaded shutoff element interacting with the seat which is movably mounted in the valve cage. In the cage there is a cavity and a bottom with holes therein, in the cage cavity there is a spring for pressing a locking element to the seat, wherein the cage in the longitudinal section has a bowl shape formed by a first cylindrical portion and a second elongated cylindrical portion of a smaller diameter. In said cage portions there is the locking element made in the form of a rod with a semicircular head interacting with the seat. The seat is made with an outer thread and screwed into the central threaded body hole, the seat end is pressed to the end face of the first cylindrical cage portion, the rod end of the locking element is located inside the spring, wherein the body, the rod and the cage are made with projections, the end of the cylindrical cage portion is pressed to the body projection. A spring is between the rod and the cage projections, one spring end rests against the cage projection, and the other spring end rests against the rod projection.

EFFECT: increased efficiency of the return valve.

3 cl, 1 dwg