FIELD: oil and gas industry.
SUBSTANCE: invention relates to oil and gas industry, in particular to check ball valves. Valve comprises hollow cylindrical body (1) with internal annular projection (2), valve pair installed in the body in the form of seat (3) and shutoff element (4), cage (5) with longitudinal grooves (6) on the inner surface of cage (5). Annular resilient element (7) is placed between inner annular projection (2) and cage (5). Valve comprises pressure washer (8) arranged between resilient element (7) and cage (5).
EFFECT: higher reliability of valve operation with fluids containing mechanical impurities.
5 cl, 3 dwg
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