... international latest designs. (5)service life: Comparable to imported butterfly valve, with 18months warrenty for normal use 3. Working principle ... , 3A, IDF, ISO, RJT Materail Quality Stainless steel 304, 316L Power Manual, Pneumatic Size 1" ~4" , DN25~DN100, larger sizes ... advanced CNC machine from Japan for forged processing Parts of Butterfly Valve Valve body, handle, SS dish, Seal, Bolt, Platic ...