Patent ID: 8474487

Claim:
A latching valve, comprising: a housing; a supply port, defined in the housing, receiving supply pressure; a delivery port defined in the housing; an exhaust port, defined in the housing; an apply port defined in the housing; an inlet sealing member; an apply piston, fluidly communicating with the apply port and the supply port, moving as a unitary object with the inlet sealing member; a mode select valve, moving as a unitary object with the inlet sealing member, having a mode select valve outlet, the mode select valve moving between an open position, when the mode select valve outlet fluidly communicates with the exhaust port, and a closed position when the mode select valve outlet does not fluidly communicate with the exhaust port; a mode select sealing member moving between an unsealed position against the mode select valve, during which the apply port fluidly communicates with the mode select valve outlet, and a sealed position, during which the apply port does not fluidly communicate with the mode select valve outlet; a bypass spring biasing the mode select sealing member to the sealed position, a housing bore, the supply port, the delivery port, the exhaust port, and the apply port fluidly communicating with the housing bore; and a shuttle, sealingly and movably secured in the housing bore, alternately set to one of an apply position and a release position as a function of sequential pilot pressures at the apply port, acting on the shuttle, and as a function of the supply pressure acting on one of an apply pair of sealed seats with different diameters in the housing bore and a release pair of sealed seats with different diameters in the housing bore, the delivery port fluidly communicating with the supply port while the shuttle is in the apply position, and the delivery port fluidly communicating with the exhaust port while the shuttle is in the release position.