... ~DN1200 U Type Butterfly Valve. Seat: EPDM, high temperature EPDM, food grade EPDM, NBR, abrasive c)Shaft: 416S. Sand316S. S, 17-4pHS ... ~DN1200 U Type Butterfly Valve. Seat: EPDM, high temperature EPDM, food grade EPDM, NBR, abrasive Shaft: 416S. Sand316S. S, 17-4pHS, aluminum ...