A valve for processing glue or other media, the valve having magnets, in particular permanent magnets, that are used for actuating a closure member (16). Two individual magnets (22, 23) located opposite one another are provided, at least in a region which is in contact with the medium or glue, with a protective layer or covering (34), which is preferably designed as a cap and consists of titanium, other metal or plastics material, in order to protect the magnets (22, 23) against the effects of the medium.