| 摘要 |
The device for valve operation and setting the stroke of a valve (10), comprises an operating device (20), for displacing the valve body (12), which may be controlled by means of a pneumatic or hydraulic pressure medium. A flexible tube body (22) runs between the both end pieces (24, 26) of the operating device (20), the inner volume of which is pressurised with the pressure medium. One of the end pieces (24) is connected to the valve body (12) and a belt structure is fixed to both end-pieces (24, 26) which runs co-axial to the tubular body (22) and comprises two crossed belt groups, containing belts running in the same longitudinal orientation. A membrane (16) running perpendicularly across the valve housing (11) is connected to the valve body and elastically draws the valve body back on displacement. The valve stroke can be exactly controlled with just the size of the control pressure. |
