| 主权项 |
1. A down hole tool control system, comprising:
a plurality of bi-stable valves, each of the valves comprising:
a first chamber having a first aperture and a second aperture;a second chamber having a first aperture and a second aperture;a shaft having a first valve member adjacent a first end of the shaft and a second valve member adjacent an opposite second end of the shaft, the shaft movable between a first position, in which the first valve member closes off the second aperture of the first chamber and the second valve member closes off the second aperture of the second chamber to prevent fluid from passing through the second apertures of the first and second chambers, and a second position, in which the first valve member and the second valve member allow fluid to pass through the second aperture of the first chamber and the second aperture of the second chamber;a third chamber having a first aperture and a second aperture, the first aperture in fluid communication with the second aperture of the first chamber;a fourth chamber having a first aperture, a second aperture and a third aperture, the first aperture of the fourth chamber in fluid communication with the second aperture of the second chamber,wherein in the second position, the first chamber, the second chamber, the third chamber and the fourth chamber are fluidly coupled; and a common inlet conduit in fluid communication with the first aperture of the first chamber and the first aperture of the second chamber of the plurality of bi-stable valves. |
