| 摘要 |
A valve actuator comprising a screw member coupled to a valve stem and a sleeve such that rotation of the sleeve causes translation of the valve stem. The sleeve has a first end that is rotatably coupled to a housing that is fixably coupled to a valve body and a second end that projects out of the housing. The valve stem is partially disposed within the sleeve and extends into the valve body. A transmission is coupled to the housing and engaged with the sleeve. A motor is coupled to the transmission so that operation of the motor causes rotation of the sleeve. |
