| 摘要 |
In order to improve a drive arrangement (15) for valve devices (1) comprising a closing member (3), comprising a movable drive element (6) for making an operative connection with the closing member (3), pre-tensioning means for exerting a pre-tensioning force on the drive element (6) in order to hold the closing member (3) in a base position, preferably closed position, against the working forces acting on the closing member (3), and driving means (17, 21) to move the drive element (6) from the base position against the pre-tensioning force in the direction of the working forces, with a view to the disadvantages of the known drive arrangements, in particular in order to reduce the weight, it is proposed that the pre-tensioning means comprises a compressible fluid, preferably compressed air (21), enclosed in a pre-tensioning container (16), with a static pressure for producing the pre-tensioning force. |
