An electric device for cooling and storing foods, preferably for household use comprises: a first compartment (11) for storing foods; means (2) for cooling the air used for refrigerating the first compartment (11); a conduit (3) for placing the cooling means (2) and the first compartment (11) in fluid communication with each other; a non-return valve (6) operatively associated with the conduit (3), said non-return valve (6) comprising a membrane (60) and a supporting mount (62). The mount (62) or the membrane (60) comprises a protuberance (67) projecting towards the membrane (60) or towards the mount (62), said protuberance (67) defining a zone of linear or point contact between the mount (62) and the membrane (60).