... and Test: API598 Mutilevel sealing flange butterfly valve1,With 3D Eccentric structure ,the sealing ring of valve body adopts a multi ... ), 304, 316, 304L, 316L, 38CrMoAlA, 25Cr1MoV7) Packing: graphite 8) Operating type: worm gear, pneumatic actuatorDrawing and technique data sheet will be ... worked out for your confirmation before after place order. wafer type butterfly valve