| 摘要 |
A dual valve plug stem actuator device for plug or globe type valves is disclosed wherein said actuator mechanisms provide respectively coarse and fine independent movement of the valve plug stem. One actuating device controls the movement in the axial direction of the valve plug stem relative to and onto a valve seat port by the rotational movement of the threaded valve plug stem through the internal threads of an internally and externally threaded actuator nut. The other of the actuating devices controls the movement of the valve plug stem relative to and onto a valve seat port through the rotation of the internally and externally threaded valve actuator nut where rotation of the actuator nut causes movement in the axial direction of said actuator nut in relation to the stationary valve body and where the axial displacement of the actuator nut causes the same relative axial rotationless displacement of the valve plug.
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