Importance

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Abstract

An automatic shuttle valve having a valve body with a bore defined in it. A piston slide in the bore between first and second and positions and a third intermediate position. The valve distributes hydraulic fluid from a fluid supply through first and second branch conduits to respective first and second fittings leading respectively to first and second selectively operable driven mechanisms. A high pressure fitting at each end of the bore. The piston having respective first and second circular cross section, conical end blocks which are seated in the first seat of the first fitting when the piston is in the first position and the second seat of the second fitting when the piston is in the second position while the cylinder blocks are out of both of the seats when the piston is in the third position. The first and second driven mechanisms include respective first and second valves operable to receive hydraulic fluid from the first fitting or from the second fitting. The passage of fluid to the first or the second driven mechanisms moving the piston respectively toward the first or second positions and passage of fluid through both driven mechanisms moving the piston to the third position.

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First Claim