Patent ID: 7878782

Claim:
A screw compressor primarily for gaseous refrigerants, comprising a compressor housing, which comprises a male and a female screw rotor arranged in screw rotor bores in the compressor housing, which the male and the female screw rotor are co-rotatingly drivable and interacting for compressing the refrigerant, which the screw compressor comprises at least one slider, which the slider is movable in relation to the male and the female screw rotor, where movement of the slider controls the internal volume ratio of the screw compressor, which the slider is moveable in a slider housing, which the slider is operating in a direction sidewards to the plane formed by the rotational axes of the male and the female screw rotor, which the slider is operating adjacent to the screw rotors at a minimum amount of play towards the male and the female screw rotor, wherein the screw compressor comprises discharge end plates, which the discharge endplates are place between the discharge end of the male and female screw rotors and a compressor housing end plate, which the discharge end plates comprises a discharge opening, which the discharge end plates comprise discharge end walls, where the slider comprises at least two areas, which the at least two areas are cooperating with subsequent areas placed in conjunction with the discharge end walls for controlling the angular and linear placement of the slider for avoiding contact with the male and female screw rotors.