Australian Pipeline Valve - Installation, Operation and Maintenance Manual 5 EXPANDING SEAL PLUG VALVE DOUBLE BLOCK & BLEED API6D - TWIN SERIES MAIN PARTS MATERIALS No. Part Name Material 1 Body ASTM A216 - WCB, ASTM A351 - CF8, CF8M, CF3, CF3 2 Lower Bonnet ASTM A216 - WCB, ASTM A105, ASTM A351 - CF8, CF8M, CF3, CF3M 3 Bearing Assembly 4 Drain Valve Assembly 5 O-Rings NBR, PTFE, VITON 5A Gasket SW316 + Graphite 6 Gasket Spiral Wound 7 Bolt ASTM A193 - B7, A320 - B8, A193 - B8M 8 Nut ASTM A194 - 2H, A194 - 9, A194 - 8M 9 Plug ASTM A216 WCC+ENP, ASTM A182 - Gr. F6a, ASTM A182 - F22, ASTM A351 - CF8, CF8M, CF3, CF3M 10 Disc ASTM A182 - Gr. F6a, ASTM A182 - F22, ASTM A351 - CF8, CF8M, CF3, CF3M 11 Bonnet ASTM A216 - WCB, ASTM A351 - CF8, CF8M, CF3, CF3M 12 Bearing Assembly 13 Slip Sealing Ring Viton, PTFE 14 O-Rings NBR, PTFE, VITON 15 Packing Flexible graphite + stainless steel, PTFE 16 Gland ASTM A216 - WCB, ASTM A351 - CF8, CF8M, CF3, CF3M 17 Yoke ASTM A216 - WCB, ASTM A351 - CF8, CF8M, CF3, CF3M 18 Slide Bushing ASTM A216 - WCB, ASTM A105, ASTM A351 - CF8, CF8M, CF3, CF3M 19 Stem/Back Stem ASTM A182 - Gr. F6a, ASTM A182 - 316 20 Handwheel ASTM A436 Gr. 60 - 40 - 18, A216 - WCB 21 Yoke Nut ZQA 19 - 4 22 Guiding Stud ASTM A182 - Gr. F6a, ASTM A182 - F22, ASTM A351 - CF8, CF8M, CF3, CF3M 23 Pin ASTM A182 - Gr. F6a, ASTM A182 - F22, ASTM B637-718 Inconel, ASTM A351 - CF8, CF8M, CF3, CF3M 24 Sealant Nipple Assembly BLOCK & BLEED: DBB - Double Block and Bleed , method to test seat integrity with valve closed while under pressure. DIB - Double Isolation and Bleed, Bi-Directional seating. API6D definition of redundant sealing surfaces in both flow directions. Side view End view