| 摘要 |
The present invention relates to a valve device comprising an external st ructure with a longitudinal axis and a valve seat, and a valve body mounted movably inside the external structure. The valve device comprises a first be llows device permitted to be moved in a substantially radial direction, in f luid connection with a first fluid, and hydraulically connected to a second bellows device permitted to be moved in a substantially axial direction. The second bellows device is connected to a first part piston cooperating with a second part piston, thereby giving the second part piston an oppositely di rected movement relative to the first part piston, which thereby moves the v alve body relative to the valve seat. The invention also relates to a method for operation of a valve device and the use thereof.
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