Hydraulic control apparatus and method for a gearbox with clutch

The control device (100) has a pressure supply device (110) with a system pressure line (120) to provide hydraulic fluid at the required pressure. The pressure line includes a control branch for part of the transmission. There is at least one hydraulic valve (133-1) before the clutch plate (130) and gear plate (132-1). This valve is in the form of a hydraulic switching valve.