SMOKING ARTICLE WITH A VALVE

A smoking article (1, 101, 201, 301) comprises: a combustible heat source (10) having opposed front (12) and rear (14) faces; one or more airflow channels (16) extending from the front face (12) to the rear face (14) of the combustible heat source (10); an aerosol-forming substrate (30) downstream of the rear face (14) of the combustible heat source (10); and a thermostatic bimetal valve (20, 120, 220, 320) located between the rear face (14) of the combustible heat source (10) and the aerosol-forming substrate (30). The thermostatic bimetal valve (20, 120, 220, 320) is arranged to deform from a first position, in which the valve (20, 120, 220, 320) substantially prevents or inhibits fluid communication between the one or more airflow channels (16) and the aerosol- forming substrate (30), to a second position, in which the one or more airflow channels (16) and the aerosol-forming substrate (30) are in fluid communication, when the thermostatic bimetal valve (20, 120, 220, 320) is heated to above a threshold temperature. Fig.1A