| 摘要 |
A fluid-operated actuator (1) for controlling the actuation of valves in general, comprising an element for indicating the opening and closure of a valve which can be associated with the end of an actuation shaft (3) of a valve. The actuation shaft (3) has, at one end, a square portion (10) and, in a central portion, pinions (4, 5) which can be associated with the racks (6,7) of actuation pistons (8, 9), the actuator further comprising an engagement element (20), which can be at least partially inserted in a cavity (22) formed within the square portion (10), the engagement element (20) forming a base slot (23) which acts as an indication element and recesses (30) for locking in the cavity (22), the recesses (30) being rotated by 45° with respect to each other about the axis defined by the actuation shaft (3). |
