| 摘要 |
The invention relates to an actuator for axial displacement of an object. The actuator comprises a cylinder volume having a first portion (6), and an actuator piston disc (5) that is displaceable back and forth in the axial direction in said cylinder volume between an inactive position and an active position, an inlet channel (11) extending between a pressure fluid inlet (12) and the first portion (6) of the cylinder volume, a first inlet valve body (15) arranged in said inlet channel (11), an outlet channel (13) extending between the first portion (6) of the cylinder volume and a pressure fluid outlet (14), and an outlet valve body (37) arranged in said outlet channel (13). The actuator is characterized in that the slave piston (17) is displaceable back and forth in a bore (18), the slave piston (17) being configured to during its movement from the inactive position to the active position displace said first inlet valve body (15) to an active position, the slave piston (17) interacting with an opening (28) that connects the bore (18) and a control pressure channel (29), said opening (28) having a first flow area (Al) when the slave piston (17) is located in its inactive position and a larger second flow area (A2) when the slave piston (17) is located in its active position. |
