Abstract: The disclosure relates to a valve operator which may be used for controlling an inlet valve to a steam turbine. The valve operator has a trip position for rapidly closing the steam inlet valve and a reset position whereby the position of the steam inlet valve may be hydraulically controlled. The valve operator includes a manual operator and a remote powered operator. A trip relay and a reset pilot are fluidly interconnected so that the valve operator must be reset after each trip. The valve operator also includes a valve position feedback mechanism.

Abstract: A vibration detection probe holder for use in measuring the vibration of a shaft employed in rotating machinery such as turbines or generators comprises a stationary probe housing fixed to a bearing bracket or other suitable stationary member. Upon initial assembly, the housing is accurately positioned in close proximity to the shaft. This probe housing is provided with stop means which determine the exact location of a vibration detection probe when such a probe is inserted in the housing, thereby obviating any risk of contacting the rotating shaft with the probe should such an insertion be required while the shaft is rotating. The stop means also ensure that any replacement probe will be located the same distance from the rotating shaft as the probe initially provided in the holder thereby ensuring continuing accurate readings obtained from any such replacement probes.