Welding butterfly valve Size: 1/2"~6" (dn15~dn150) Material: Stainless steel 304 or 316l Standard: GB, idf, ISO, DIN, 3a Applications: Dairy, beer, food, beverage, pharmacy, and biotechnology, etc. Sanitary valves we manufacture: Welding butterfly valves, clamp butterfly valves, threaded butterfly valves, 3 piece butterfly valves, pneumatic butterfly valves, clamp ball valves, non-stay ball valves, flange-threaded ball valves, threaded triple ball valves, clamp diaphragm valve, clamp pneumatic diaphragm valve, welding check valves, clamp check valves, threaded check valves, flange butt clamp check valves, welding sampling valves, threaded sampling valves, asepsis sampling valves, liquid indicator, safety valves, manual stop valves, pneumatic stop valves and etc. Welcome to contact us for free.