| 摘要 |
A two-way ball valve ( 10 ) for liquid and/or gas flowing media, essentially comprises a valve fitting ( 12 ) made up of two connected housing parts ( 22, 28 ), in which a ball ( 18 ) with a drilling ( 20 ) for the media flow and an operating shaft ( 68 ) running perpendicular to the drilling ( 20 ) is mounted such as to be able to rotate. Furthermore, sealing shells ( 40, 42 ) are arranged to both sides of the ball ( 18 ) respectively, coaxial to the longitudinal axis (L) of the valve fitting ( 12 ), which enclose the ball ( 18 ) and completely fill the dead volume ( 38 ) between the valve fitting ( 12 ) and the ball ( 18 ). Said sealing half-shells ( 40, 42 ) have a front opening for the operating shaft ( 38 ) in the axial direction (L), corresponding to the cross section of the drilling ( 20 ) in the ball ( 18 ). The sealing half-shells ( 40, 42 ) only contact the ball ( 18 ) in the region of the front openings thereof, between which a narrow sickle-shaped annular gap is formed. In one embodiment a control diaphragm ( 58 ) is include on the inlet side of the flowing medium ( 16 ).
|
