US Patent 10458559 Double flapper valve for a variable cam timing system

An inlet check valve for controlling fluid from a supply into a variable cam timing phaser includes a double flapper check valve assembly with an open position and a closed position, which includes a housing having a body forming at least two stoppers, a flapper valve comprising at least two flexible flaps received within the housing and aligned with the at least two stoppers, and a valve seat received within the housing, the valve seat defining openings aligned with the at least two flexible flaps, axially opposite the two stoppers. In another embodiment, the stoppers are on a stopper piece separate from the housing.