Relief valve Alfa Laval relief valves prevent vacuum or pressure build up inside tanks or vessels used in the brewery, food and beverage, personal care and biopharm industries.     Sight glasses Alfa Laval sight glasses are accurate gage glasses that permit direct distortion-free visual inspection of process conditions, products, liquid levels and cleaning inside vessels used in the dairy, food and beverage, personal care and biopharm industries.                 Tank feet Alfa Laval tank feet provide fully adjustable support for free-standing tanks or vessels used in the brewery, food and beverage, personal care and biopharm industries.