<p>Force-actuated valve drive comprises a cam element (60) which controls only the opening movement of a valve unit (4, 5) in a low revolution region. Preferred Features: A further cam element (40) has an inner contour (38) for interacting with a binding element (34) in a high revolution region and an outer contour (44) in contact with a contact surface (48) of a coupling device (20) in a high revolution region. The coupling device has coupling elements which are coupled with a valve shaft (13) of the valve unit (5).</p>
