A rotary machine for fluid processing, comprising a static casing (2) with a first and second port (H, L) for allowing fluid out of and into the rotary machine. The rotary machine comprises a rotor body (4, 4) attached to a main shaft (3) arranged within the static casing (2), the rotor body (4, 4) has a center axis (R) arranged an offset distance (e) from a center axis (M) of the main shaft (3), the rotary machine further comprising a sealing vane (5, 5) having a vane tip (6, 6), and a vane moving system (8, 8) operationally connected between the rotor body (4, 4) and the sealing vane (5, 5) for maintaining a vane tip seal face (6a, 6c) of the vane tip (6, 6) in a sealing proximity to the rotor body outer face (4a, 4b).