Patent ID: 8590571

Claim:
A latching valve, comprising: a housing; a supply port defined in the housing; a delivery port defined in the housing; an exhaust port defined in the housing; an apply port defined in the housing, the apply port being sealingly fluidly isolated from the supply port, the delivery port, and the exhaust port; an apply piston having a face in fluid communication with the apply port; a release port defined in the housing, the release port being sealingly fluidly isolated from the supply port, the delivery port, and the exhaust port; a release piston having a face in fluid communication with the release port; a bore defined in the housing, the supply port, the delivery port, the exhaust port, the apply port, and the release port fluidly communicating with the bore; an inlet seat in the bore; an exhaust seat in the bore; and a shuttle, sealingly and movably secured in the bore, set to one of an apply position and a release position as a function of respective pilot pressures at the apply and release ports, 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, the shuttle including: a sealing member movably positioned between the inlet seat and the exhaust seat, the sealing member sealingly engaging the exhaust seat while the shuttle is in the apply position, the sealing member sealingly engaging the inlet seat while the shuttle is in the release position, and while the shuttle is in the release position, a difference in bore diameters at the inlet seat and the apply piston causes a pressure at the supply port to maintain the seal between the sealing member and the inlet seat.