The invention relates to an electronically operated control valve, for refrigeration and heating applications, comprising a main tube with two end pieces serving as inlet and outlet and an elastic part piece, which may be pressurised by an enclosing chamber to change the shape and hence flow cross-section thereof. Said enclosing chamber is filled with a filling medium, the pressure of which is dependent on the temperature thereof and which cooperates with an electronically operated pressure regulation device. The enclosing chamber (12) is formed between an extension (14) of the main tube (2) and a perforated support tube (16). The elastic part piece is made up of a hose (8), fixed and sealed at the end between the extension and the support tube. The pressure control device is embodied as a separate pressure generator (10) connected to the enclosing chamber (12) by means of a connector tube(18).