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