Check valve, in particular for a refrigeration or heating circuit, which is insertable in a connection point of a connection device which has a feed opening for the feed of a medium and an outlet opening for the discharge of the medium, - with a multi-part housing (12, 14), which comprises a valve housing and a base housing, which is connectable to one another via an interface by means of connecting elements (41, 42), - with a regulating chamber formed between the base housing and the valve housing, in which a valve closing member is provided, which in a closed position bears against a valve seat of the valve housing and closes an opening in the valve housing and is transferrable into a working position against an actuating force of a resetting element and releases the valve opening, wherein the valve housing and the valve closing member arranged displaceably in the regulating chamber lie in a common longitudinal axis, characterized in - that the interface between the valve housing and the base housing comprises an axial play, by means of which the distance between the valve housing and the base housing is varyable, and - that a distance between a mounting section provided on the base housing, by means of which the base housing is fixable to the connection point by a releasable fastening element, and an end face on the valve housing opposite the base housing has an installation length when the base housing is arranged with respect to the valve housing with play, which is smaller than an installation dimension in the connection point and, when the base housing is arranged relative to the valve housing without play, the base housing and the valve housing have a length which is equal to or greater than the installation dimension of the connection point. - with a multi-part housing (12, 14), which comprises a valve housing and a base housing, which is connectable to one another via an interface by means of connecting elements (41, 42), - with a regulating chamber formed between the base housing and the valve housing, in which a valve closing member is provided, which in a closed position bears against a valve seat of the valve housing and closes an opening in the valve housing and is transferrable into a working position against an actuating force of a resetting element and releases the valve opening, wherein the valve housing and the valve closing member arranged displaceably in the regulating chamber lie in a common longitudinal axis, characterized in - that the interface between the valve housing and the base housing comprises an axial play, by means of which the distance between the valve housing and the base housing is varyable, and - that a distance between a mounting section provided on the base housing, by means of which the base housing is fixable to the connection point by a releasable fastening element, and an end face on the valve housing opposite the base housing has an installation length when the base housing is arranged with respect to the valve housing with play, which is smaller than an installation dimension in the connection point and, when the base housing is arranged relative to the valve housing without play, the base housing and the valve housing have a length which is equal to or greater than the installation dimension of the connection point.