The above DBB valve is with 3 pieces body design. It consist of 2 ball valves and 1 needle valve, with the fuction of double block and bleed. End connection is flange inlet by flange outlet. Flange size from 1/2"-4" apply to ASME B16.5. Pressure class from 150lb to 2500lb. All kinds of materials are available, Carbon steel, Stainless steel and duplex stainless steel and other alloy steel.