API 6D Expanding gate valve

API 6D Expanding gate valve Main features: Expanding gate valve is an efficient and reliable through-conduit gate valve, with two floating seats and parallel expanding gate and segment. The expansion action between gate and segment provides a tight mechanical seal on both upstream and downstream. Full bore through conduit design can eliminate flow turbulence. Pressure drop is no larger than through an equal length of pipe. Design standard ：API 6D Product range ： 1.Pressure range ：CLASS    150Lb~2500Lb 2.Nominal diameter ：  NPS        2~48″ 3.Body material：Carbon steel, Stainless steel, duplex stainless steel, Alloy steel, Nickel alloy 4.End connection ： RF   RTJ   BW 5.Mode of operation：Hand wheel, Gear box, Electric, Pneumatic, hydraulic device, Pneumatic-hydraulic device； Product features： 1.Bidirectional seats design, so the seats can be sealed against pressure source in either direction. 2.Bidirectional seals, no limitation on the flow direction； 3.When valve is in full open position, seat surfaces are outside flow stream that always in full contact with gate that can protect seat surfaces, and suitable for pigging pipeline; 4.Non-rising stem design can be chosen; 5.Spring loaded packing can be chosen; 6.Low emission packing can be chosen according to ISO 15848 requirements; 7.Extended Stem design can be chosen; 8.Normally open type or normally close type with Through conduit design;