Internal gear pump

An internal gear pump comprising:

• a pinion capable of rotating about a first axis of rotation;
• a ring arranged around the pinion, having a cylindrical periphery and being configured to rotate about a second axis of rotation that is different to the first axis of rotation and parallel thereto, the pinion and the ring being arranged to delimit a work space comprising a high-pressure space and a low-pressure space;
• a first support element arranged on a first side of the ring to limit the movement thereof in a first sense along a first orientation that is substantially parallel to the first and second axes of rotation;
• a second support element arranged on a second side of the ring to limit the movement thereof in a second sense that is opposite the first sense and in the first orientation;
• a cylindrical wall arranged around the ring to limit the movement thereof in a plane that is substantially perpendicular to the second axis of rotation;
• a first high-pressure recess in an arc of a circle and in fluid contact with a first portion of the cylindrical periphery of the ring;
• a first low-pressure recess in an arc of a circle and in fluid contact with a second portion of the cylindrical periphery of the ring, the first high-pressure recess and the first low-pressure recess being separated;
• a first high-pressure conveying means forming a fluid connection between the high-pressure space and the first high-pressure recess;
• and
• a first low-pressure conveying means forming a fluid connection between the low-pressure space and the first low-pressure recess,
• wherein the first high-pressure recess is symmetrical to a second plane passing through the second axis of rotation and perpendicular to a first plane passing through the first and second axes of rotation, and the first low-pressure recess is symmetrical to said second plane.