FIELD: oil and gas industry.
SUBSTANCE: ball check valve contains a hollow cylindrical body with an internal annular projection, a valve pair installed in the body in the form of a seat and a shut-off element and a cage with longitudinal grooves on the inner surface of the cage. Annular projection is made skewed at an angle of skew to the plane perpendicular to the axis of symmetry of the body, towards the seat so that along the said axis of symmetry the base of the annular projection is distanced from the seat further than the top of the annular projection from the seat. Section of the body from the top of the annular projection to the seat is made parallel to the axis of symmetry of the body to accommodate the shutoff element. Cage adjoins the annular projection in the area of the annular projection base.
EFFECT: improving operating reliability of the ball check valve when it is used with liquids containing mechanical particles.
6 cl, 1 dwg
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