Abstract: Shuttle valves are disclosed including a housing with an inlet and two outlets and with a self-aligning valve therein which includes a seat for closing one of the outlets. The seat includes a valve disc with a spherical seating surface corresponding to the surface of the outlets, and the valve disc includes a stem which has an axes aligned with the radius of the spherical seating surface. The valve includes an actuator for selectively closing one of the outlets with the seat by moving the seat along a predetermined path between the two outlets and transversely to that path into seating engagement therewith.