FIELD: oil and gas industry.
SUBSTANCE: invention relates to oil and gas production industry and can be used to separate the zones of the tubing string and the annular space, and also for dissociation of various equipment cavities during repair, isolation and research works. Valve comprises a hollow body with an inlet and an outlet, locking element of a tight elastic material, provided with a rigid element, the shape and size of which correspond to the overlapping passage opening of the saddle. At least two channels are formed in the peripheral part of the locking element, and the saddle at the entrance to the passage opening in the contact area with the contact surface of the locking element is provided with a section with a smooth curved surface.
EFFECT: technical result consists in increasing the reliability of the valve and simplifying its design by eliminating the cause of the jet streams due to obstructions in the flow path of a fluid.
1 cl, 3 dwg
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