The Food & Beverage steam valve series ball valves are special versions of the Marwin 2000F and 4700F series, intended for 150 psi or lower pressure steam service in plants requiring use of FDA or equivalent "food grade" engineered plastics or elastomers throughout the plant, regardless of service. Stainless steel valves are "prepared for food service", and carbon steel valves are "prepared for oil free service", which means special cleaning and lubrication (USDA H-1 incidental contact lubricant for SS valves and Krytox for CS valves).
Marwin Food & Beverage Series Steam Ball Valves Specifications:
FDA 21 CFR 177.550, FDA 21 CFR 177.2600
Other parts' material
Seats, thrust washers, body seals, and packing: Teflon (TFM 1600)