| 摘要 |
<p>A fluid-actuated valve control actuator, comprising a body (2) in which two mutually opposite pistons (3) are accommodated, each piston (3) being provided with a rack (4) and being adapted to engage a shaft (6) for actuating a stem of a valve, characterized in that an end (9) of the actuation shaft (6) that lies opposite to an end adapted to engage the stem of a valve is octagonal for engagement with an indicator (10) for indicating the opening/closure of the valve. <IMAGE></p> |
