Valve having a metal-bellows/piston unit

A valve (1) comprising a valve housing (4) and a closing body (3) arranged in a longitudinally moveable manner in the valve housing (4), wherein at least one inlet channel (5) and at least one outlet channel (6) are arranged in the valve housing (4), wherein the closing body (3) interacts by longitudinal movement with a valve seat (8) formed in the valve housing (4) and thereby opens and closes at least one hydraulic connection between the at least one inlet channel (5) and the at least one outlet channel (6), characterized in that the closing body (3) is drivable by a metal-bellows/cylinder unit (2), wherein the metal-bellows/cylinder unit (2) has a length-variable metal bellows (20), wherein the metal bellows (20) bounds a volume-variable working chamber (23) in a sealing manner, wherein the closing body (3) comprises a first closing cylinder (3a) and a second closing cylinder (3b), wherein the first closing cylinder (3a) interacts with the valve seat (8), and wherein the second closing cylinder (3b) interacts with a further valve seat (8b) formed in the valve housing (4).