... to API609 Face to face:ANSI B16.10 Tubing flange:BS,DIN,JIS,ANSI, Driving Style:Lever,gear,actuator ... structure friction of the sealing ring, providing the valve a long service life.3, Bubble-tight sealing ... products are cast iron (soft seated and metal seated) gate valves, globe valves,check valves,butterfly valves, ball valves ... for business cooperation and visit our company. flange butterfly valve