STOP VALVE Russian patent published in 2012 - IPC F16K1/32 F16K25/00 

FIELD: construction.

SUBSTANCE: stop valve comprises a casing 1 with an outlet nozzle 2, an inlet nozzle 3, connected to the casing 1, a spindle 10 with a drive 9, a stem 12 with a stop element 14 and a seat 5. The sealing surface 6 of the seat 5 is made as conical with exceeding of its cone angle above the cone angle of the conical sealing surface 15 of the stop element 14. The sealing surface 17 of the casing 1 and the sealing surface 16 of the inlet nozzle 3 are made as conical with exceeding of the cone angle of the sealing surface 17 of the casing 1 above the cone angle of the sealing surface 16 of the inlet nozzle 3. The specified exceeding of the cone angle of sealing surfaces 6 and 17 of the seat 5 and the casing 1 above the cone angle of the sealing surfaces 15 and 16 of the stop valve 14 and the inlet nozzle 3 makes 2…3°±1°.

EFFECT: invention provides for higher tightness of connection and increased reliability of valve operation, extension of its operational resource.

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