Patent ID: 8408245

Claim:
A valve actuating arrangement comprising: a valve body; a valve member comprising a shaft, a piston connected to the shaft; the valve member being movable by operation of the piston and being disposed in the valve body, the valve body comprising a valve chamber that provides fluid communication between an inlet passage, an outlet passage and a vent passage based on the position of the valve member, the valve member having an open and a closed position to control flow of process media between the inlet passage, the outlet passage and the vent passage in response to operation of the piston, the shaft being disposed in and extending through a sealed chamber, the sealed chamber being sealed at one end from the valve chamber and at another end from a piston chamber, the piston being disposed in the piston chamber, and a vent that extends from the sealed chamber to an external surface, wherein the shaft extends axially in both directions past sealed ends of the sealed chamber.