| 摘要 |
The setting members (25) have end surfaces facing the corresponding end flange. End surfaces are provided with recesses (40, 41) communicating with a pressure gas source (38) for creating a pressure gas cushion between each setting means (25) and corresponding end flange (12). The hinged sector plates (6, 8) are influenced outwardly from the ends of the cylindrical part by resilient members (37) and/or balancing members and in the opposite direction by pressure medium operated push member (34, 35). The pressure medium of which being arranged to cease in case of a breakdown of the pressure from the pressure gas source feeding the setting control (25). - The pressure gas source feeding the pressure gas cushions of the units (10) also is connected to the push member (34, 35) including a piston (35) attached to the sector plates (6) and operated by the push member against the action of a compression spring (37) acting upon the piston. |
