A valve assembly comprising: - an inlet opening adapted to receive fluid medium in a liquid state, - a distributor comprising an inlet part fluidly connected to the inlet opening, the distributor being arranged to distribute fluid medium received from the inlet opening to at least two parallel flow paths, - an outlet part comprising at least two outlet openings, each being adapted to deliver a fluid medium in an at least partly gaseous state, - a first valve part and a second valve part arranged movable relative to each other in such a manner that the mutual position of the valve parts determines the fluid flow from the inlet opening to each of the outlet openings of the outlet part, the first valve part comprising a plurality of openings and the second valve part comprising a plurality of openings, the fluid flow from the inlet opening to each of the outlet openings being determined by a mutual position of the openings of the first valve part and the opening(s) of the second valve part, - a header forming an integral part of the valve assembly, said header being arranged to form an interface towards a heat exchanger comprising at least two flow paths, and said header providing fluid connections in such a manner that each of the outlet openings is fluidly connected to a flow path of a heat exchanger connected to the header, characterized in that the number of openings of the first valve part is equal to the number of openings of the second valve part, and the openings are positioned in such a manner that pairs of corresponding openings in the first and second valve parts are defined, the openings of each pair of corresponding openings being arranged at least partly overlappingly in response to mutual movement of the first valve part and the second valve part, each pair of openings being fluidly connected to one of the outlet openings, and the mutual position of the valve parts determining an overlap between a given opening of the first valve part and a given opening of the second valve part, thereby defining an opening degree towards the corresponding outlet opening. - an inlet opening adapted to receive fluid medium in a liquid state, - a distributor comprising an inlet part fluidly connected to the inlet opening, the distributor being arranged to distribute fluid medium received from the inlet opening to at least two parallel flow paths, - an outlet part comprising at least two outlet openings, each being adapted to deliver a fluid medium in an at least partly gaseous state, - a first valve part and a second valve part arranged movable relative to each other in such a manner that the mutual position of the valve parts determines the fluid flow from the inlet opening to each of the outlet openings of the outlet part, the first valve part comprising a plurality of openings and the second valve part comprising a plurality of openings, the fluid flow from the inlet opening to each of the outlet openings being determined by a mutual position of the openings of the first valve part and the opening(s) of the second valve part, - a header forming an integral part of the valve assembly, said header being arranged to form an interface towards a heat exchanger comprising at least two flow paths, and said header providing fluid connections in such a manner that each of the outlet openings is fluidly connected to a flow path of a heat exchanger connected to the header,