Valve unit with a sliding throttle-chamber and circuit comprising a valve

A valve unit, comprising:

• a valve body having a distribution chamber partly shaped and adapted to receive a sliding throttle-chamber moveable in a guided manner in a direction of a shaped extension of said distribution chamber, and the throttle-chamber being moveable between two opposed extreme translation positions, wherein the translation positions define ways of fluid communication between an inlet opening and at least three outlet openings that are formed in the valve body that can be selectively released and blocked by said throttle-chamber for directly controlling fluid communication between said inlet and said at least three outlet openings, one of said outlet openings opening axially into said distribution chamber and the other two outlet openings opening radially with respect to said distribution chamber and being radially arranged around said valve body, said inlet and said two outlet openings not being aligned along an axis of symmetry of said distribution chamber corresponding to the direction of the shaped extension of the chamber;
• and
• wherein said throttle-chamber has a composite structure including a first part for directly controlling fluid communication through only the two radial outlet openings, and the throttle-chamber further comprising a second part for directly controlling fluid communication through only the axial outlet opening, and wherein the first and second parts are linked together by a driving link comprising a non-driving area located between the two opposed extreme translation positions of said throttle-chamber , and said first and second parts being in a positive driving engagement through said link in order for the second part to release the one axial outlet opening.