Australian Pipeline Valve - Installation, Operation and Maintenance Manual 4 EXPANDING SEAL PLUG VALVE DOUBLE BLOCK & BLEED API6D - TWIN SERIES PERFORMANCE SPECIFICATION TECHNICAL SPECIFICATION Class (MPa) Shell Test (MPa) Seating Test Suitable Suitable Operator Handwheel, bevel gear,electric-actuated Temp. Medium 150 3.0 2.2 180°C* Water oil and gas Design Standard API599, API6D, ISO 14313 300 7.5 5.5 Face to Face ASME B16.10 600 15.0 11.0 Flange End ASME B16.5 900 22.5 16.5 Test and Inspection API598, API6D * High/ low temperature available up to 2500 Class. Non-slam The operator is self locking so that line pressure cannot force the plug to rotate. This prevents slamming and risk of injury. Tight shut off When the valve is closed, the seating segments are wedged tightly between the plug and body metal to metal. The soft seat material is compressed into the recessed groove. The design does not require springs or pressure to effect a seal. Double block and bleed and zero leakage The Twinseal valve provides upstream and downstream seal in both directions and a bleed point is then provided between the two seats, to prove no leakage. Zero-leakage The Twinseal meets the demands of frequent cycling and verifiable, reliable zero leakage with positive shut-off upstream and downstream. Zero wear Twinseal valves provide positive shut-off with zero leakage. The design of the valve ensures that during opening and closing the seals are not in contact with the body. Only at the last stage of closing does the seal contact the body - and then the force is compression only. Every turn of the handwheel retracts the seals from the body. That means no wear to the seals and long life. Large port Twinseal valves have a nominal plug port of 60 - 70% thus effecting minimum pressure drop. True circular full port also available. Closing Operation