Patent ID: 9618136
Date: 2017-04-11
CPC Classifications: F16K,Y10T

Claim:
1. An apparatus, comprising: an actuator housing defining an explosion-proof enclosure boundary; an actuator output shaft having a first shaft portion and a second shaft portion, the first shaft portion partially disposed within the explosion-proof enclosure boundary, and the second shaft portion disposed outside of the explosion-proof enclosure boundary; an O-ring seal at least partially defining the explosion-proof enclosure boundary and disposed in the actuator housing, the O-ring seal to directly contact an outer diameter of the actuator output shaft, the O-ring seal defining the first and second shaft portions, wherein the second shaft portion defines an indicating portion of the actuator shaft; a visual position indicator; and a scale aligned with the visual position indicator to indicate a rotational position of the actuator output shaft relative to the actuator housing.