The disclosed embodiments relate to a valve assembly that includes a valve body that has a cavity having one or more seating surfaces, a ball body disposed within the valve body and configured to engage the one or more seating surfaces to form a seal, and an actuator configured to drive the ball body in a first axial direction along a central axis of the cavity to wedge the ball body against the one or more seating surfaces to form the seal, and where the actuator is configured to move the ball body in a second axial direction along the central axis to unseat the ball body and to rotate the ball body about the central axis between an open position and a closed position.