FIELD: machine building.
SUBSTANCE: invention relates to check valve design and can be used with electric-centrifugal or sucker-rod deep-well pumps. Non-return valve comprises body and ball and seat arranged therein. According to the invention, the valve comprises an injection grid with holes, above the pressure grid there is a filter made of wire-permeable material moving along the valve axis and pressed to the grid by a spring mechanism. Filter on the side of the grid has the shape of a truncated cone.
EFFECT: technical result is improvement of reliability of the valve operation.
5 cl, 3 dwg
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