Abstract: In order to improve a screw compressor comprising a housing with a rotor chamber, two screw rotors arranged in the rotor chamber, a slide for controlling the capacity adjoining the rotor chamber, an adjusting device comprising a cylinder and an associated control device with which an inflow and a return flow of the medium provided for actuating the cylinder is controllable in a continuous control mode, such that the control device operates reliably, it is proposed that the cylinder chamber comprise a return flow opening and an intermediate return flow opening, and that the control device activate the return flow opening in the control mode for continuous control in a partial control range between an intermediate position and a minimum position, and activate the corresponding intermediate return flow opening defining the intermediate position for continuous control of piston positions outside of the partial control range.