A pneumatic valve for limiting the pressure level of a fluid between a pneumatic component (5) and a vacuum source (3). The valve has a casing (11) with a skirt (21) that is mounted to divide the casing (11) into a first chamber (17) and a second chamber (19) with a first orifice (13) that allows a supply of fluid from the vacuum source (3) to the first chamber (17), a second orifice (15) connecting the first chamber (17) with the pneumatic component (5) and a third orifice (23) that allows a high pressure pneumatic fluid to be supplied to the second chamber (19). An elastic member (27) interposed in the first chamber (17) between the skirt (21) and the casing (11) in the first chamber (17) at least one connecting orifice (13, 15) and thereby control communication of fluid between the vacuum source (3) and the pneumatic component (5).