The hydraulic component that automatically directs fluid from ether the normal source or an emergency source to an actuating cylinder is called shuttle valve.
It is possible for fluid to pass through a shuttle valve from one of two sources. A shuttle valve is typically found in pneumatic systems, though it can also be found in hydraulic ones on occasion.
A shuttle valve's fundamental design resembles a tube with three openings—one at each end and one in the center. Within the tube, a ball or other obstructing valve component can freely move. The ball is pushed toward the other end when pressure from a fluid is applied through an aperture on one end. This limits the fluid's ability to pass through one aperture while allowing it to pass through the larger opening in the middle.
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