| 摘要 |
The pressure-operated valve device (1) has a pressure-medium inlet connection (11), an outlet connection (12) and a cylinder in which a piston (24) connected to a closing part (13) is displaceable. The piston divides the cylinder into a first piston space (21) and a second piston space (22). Two relief lines (44, 45), each containing a control valve (441, 451), are connected to the piston spaces (21, 22) and lead to a pressure-medium sink (reservoir). A first connecting line (41), containing a control valve (411), leads from the inlet connection (11) to the first piston space (21), and a second connecting line (42), containing a control valve (421), leads from the inlet connection (11) to the second piston space (22). The second connecting line (42) has a non-return valve (422) opening in the direction of the second piston space (22), and a third connecting line (43) is provided between the first and the second connecting line. This makes it possible to move the closing part at two different speeds. <IMAGE>
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