Valve

摘要

A valve, for example for controlling a clearance at a tip of turbine blades, includes a piston and a supply mechanism supplying fluid under pressure to cause the piston to move inside a hollow body, and a mechanism detecting a position of the piston, including a shut-off element that moves as one with the piston and is mounted such that it can move in a fluid passage between two positions, open and closed respectively, the fluid passage connecting the supply mechanism to a pressure sensor that generates an output signal representative of the position of the piston of the valve.

主权项

1. A valve comprising:
a piston slidably mounted in a hollow body; a first rod rigidly connected to the piston and configured to be connected to a movable member; means for supplying the hollow body with pressurized fluid for moving the piston in the hollow body between an initial position and a final position; means for returning the piston to the initial position when the fluid pressure is less than a given pressure; and means for detecting a position of the piston, the means for detecting comprising a shut-off element that moves as one with the piston and is mounted such that it can move in a fluid passage between two positions, open and closed, of the fluid passage, the fluid passage being connected via one end to the means for supplying the hollow body with pressurized fluid and via another end to a pressure sensor generating an output signal representative of the position of the piston of the valve.