A valve control system with an adjustable camshaft

The present invention relates to a valve control system (1) with at least one adjustable camshaft (10) comprising an outer shaft (11) and through the outer shaft (11) therethrough extending inner shaft (12), and comprising a first at least one phase shifter (13) actuator (14) and a relative to the first actuator (14) rotatable second control element (15), wherein the outer shaft (11) and the inner shaft (12), each with one actuator (14, 15) are connected. According to the invention, a stop (16) is at least provided, which with the outer shaft (11) rotationally coupled, and it is a counter-stop (17) is provided, the rotationally fixed to the inner shaft (12) is coupled, wherein the maximum rotation angle of the inner shaft (12 ) is determined in the outer shaft (11) by an abutment of the stop (16) on the counter-stop (17).