... operator, electric or pneumatic actuatorMaterials of main parts DescriptionMaterialBodyCLASS B, GR. 65-45-12SeatNBR , EPDM,VITON, PTFEDiscGR. 65-45-12, CF8M ... 410, SS416, SS 316, Carbon SteelBushingPTFE or BronzeRingNBRPinSS 416, SS316 U Section Wafer Type Butterfly Valve