FIELD: valve production.
SUBSTANCE: valve comprises a valve body, a ball selectively rotating inside the valve body, a seat made inside the valve body and containing a cavity with an inclined wall, and a seat insert. The insert is located partially inside the cavity and has a first sealing surface that forms the first sealing surface of contact with the ball to prevent leakage through the first leakage path, and a second sealing surface that forms a second sealing surface of contact with the inclined wall to prevent leakage through the second leakage path. The valve body contains a retaining plate that forms a secondary cavity within the seat cavity. It also contains a spring located in the secondary cavity and configured to press the seat insert against the inclined wall.
EFFECT: preventing leakage of the valve.
12 cl, 3 dwg
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