| 摘要 |
An actuator, comprising a cylinder (1), an actuator piston (2) displacably arranged in the cylinder (1), a pressure fluid circuit having a channel (3) mouthing in said cylinder (1), an indirectly electrically controlled first valve body (4), arranged in said channel (3) for controlling a flow of a pressure fluid in said channel (3), and a second valve body (5), arranged in or at said channel (3) to open and close the channel (3), the second valve body (5) being a member fixedly connected to the actuator piston (2), and the first valve body (4) and the second valve body (5) being arranged in series with each other in said channel (3). The actuator further comprises an electrically controlled three-way valve ( 18) that is arranged to alternately open for a pressure fluid flow from a high pressure source (HP) and a pressure fluid flow from a low pressure source (LP), chosen pressure fluid flow being arranged to act against and admit displacement of the first valve body (4). |
