SHUTOFF VALVE Russian patent published in 1995 - IPC

FIELD: valving. SUBSTANCE: flexible cylindrical wall of the hollow closure member faces the outer conical sealing surface of the seat. The non-metal sealing member is in contact with the inner surface of the wall. The sealing member is pressed by a washer having a collar which is in contact with the inner surface of the cylindrical wall of the sealing member. The collar is made up as a thin flexible wall. Conical surfaces, which are parallel to the sealing surface of the seat, are made on the end faces of the cylindrical wall of the member and washer. The sealing member is mounted in such a manner to allow the edge of the cylindrical wall of the sealing member to be projected above mentioned conical surfaces. The end of the cylindrical wall of the sealing member is projected by the value of flexible deformation of a material. EFFECT: enhanced reliability. 2 cl, 2 dwg