... 2.Disc : Cast Iron , Ductile Iron , Bronze , SS304 3.Seat : EPDM , PTFE , NBR , VITON . 4.Stem : Carbon Steel , ... DIN / ANSI / JIS/ ASE / ASD / BS10D / BS10E / UNIInspection and test : API598 , ISO5208-1982Drving style : Lever , gear , actuator , ... Electronic Flange Butterfly valve , Pneumatic Flange Butterfly Valve .4.Double eccentric Butterfly valve , (eccentric /pneumatic) eccentric butterfly valve ...