The invention relates to a valve for controlling a coolant circuit of a refrigerating system, having a housing, which has at least one inlet opening and at least one outlet opening, having a regulating chamber provided in the housing, which extends between the at least one inlet opening and the at least one outlet opening, having a valve arrangement, which is insertable at least partially into the regulating chamber, having a rotary slide arrangement, arranged in the regulating chamber, which has a control disc, which is rotatable in relation to the at least one rotary slide support, the at least one rotary slide support is provided non-rotationally to the housing and the at least one rotary slide support is mounted floatingly to the housing.