Valvesonly is a Super Duplex Globe Valve Manufacturer In USA. Duplex Group includes Super Duplex globe Valves. Substances in the duplex category have various standards, including super duplex, duplex, and lean duplex grades. One kind of Super Duplex globe Valve made of this steel is the super duplex stainless steel gate valve. The super duplex valve is made up of a hand wheel, a threaded stem that extends from the hand wheel to the gate within the body, and the gate and body.