BM5 Series slam-shut valve is an automatic shutoff appliance suitable for installation as a safety device in regulating stations and gas distribution piping. BM5 Series slam-shut valve is used in natural gas, air, propane, butane, LPG, city gas, nitrogen, carbon dioxide, hydrogen regulating or distribution installations.The slam-shut valve is designed to shutoff the flow of gas in the event of the pressure rising above or falling below the predefined levels.