A rotary selection valve, the valve comprising a stator and a rotor, said stator comprising a number of connection ports protruding into the stator and each ending in an orifice on an inner stator face, which is a face of the stator making contact in a fluid tight manner with an inner rotor face of the rotor, said inner rotor face being rotatably movable around a rotational axis relative to the inner stator face, a number of different components being connectable to the ports to the stator and being selectable in different rotation positions of the rotor, the inner stator face comprising: - a first inlet/outlet orifice connected to a corresponding first inlet/outlet port, said first inlet/outlet orifice being positioned at a first radial distance from the rotational axis of the rotor, - a second inlet/outlet orifice connected to a corresponding second inlet/outlet port, said second inlet/outlet orifice being positioned coinciding with the rotational axis of the rotor. characterized in that, the inner stator face further comprises: - pair wise connection orifices (33b-37b, 33b'-37b'), each orifice communicating with a corresponding connection port (33a-37a, 33a'-37a') and the components to be connected to the valve is adapted to be connected to two ports each, the two orifices associated with each connectable component being placed at diametrically opposite positions with respect to the rotational axis of the rotor and each said connection orifice (33b-37b, 33b'-37b') being positioned at a radial distance from the rotational axis of the rotor that is shorter than said first radial distance, and in that the inner rotor face comprises: - an essentially annular groove positioned around the rotational axis of the rotor at said first radial distance, said annular groove further having an extension that extends from one position of the annular groove towards, but not the whole way to the rotational center of the rotor with a length such that it can reach all of the connection orifices (33b-37b, 33b'-37b'), and - a radial groove extending from the rotational center of the rotor and to a length such that it can reach all of the connection orifices (33b-37b, 33b'-37b') but shorter than the first radial distance, said radial groove being generally diametrically positioned with respect to the direction of the extension of the annular groove. - a first inlet/outlet orifice connected to a corresponding first inlet/outlet port, said first inlet/outlet orifice being positioned at a first radial distance from the rotational axis of the rotor, - a second inlet/outlet orifice connected to a corresponding second inlet/outlet port, said second inlet/outlet orifice being positioned coinciding with the rotational axis of the rotor. - pair wise connection orifices (33b-37b, 33b'-37b'), each orifice communicating with a corresponding connection port (33a-37a, 33a'-37a') and the components to be connected to the valve is adapted to be connected to two ports each, the two orifices associated with each connectable component being placed at diametrically opposite positions with respect to the rotational axis of the rotor and each said connection orifice (33b-37b, 33b'-37b') being positioned at a radial distance from the rotational axis of the rotor that is shorter than said first radial distance, - an essentially annular groove positioned around the rotational axis of the rotor at said first radial distance, said annular groove further having an extension that extends from one position of the annular groove towards, but not the whole way to the rotational center of the rotor with a length such that it can reach all of the connection orifices (33b-37b, 33b'-37b'), and - a radial groove extending from the rotational center of the rotor and to a length such that it can reach all of the connection orifices (33b-37b, 33b'-37b') but shorter than the first radial distance, said radial groove being generally diametrically positioned with respect to the direction of the extension of the annular groove.