Multi-Turn valves are opened and closed by turning a wheel more than 360 degrees. Two primary examples of this type of valve are the gate valve and globe valve. To open and close the gate valve, multiple turns of the handle are required to turn an acme threaded nut on the threaded shaft of the valve causing it to open or close by raising or lowering the gate. These valves operate in one of two positions, open or closed, and are not recommended for throttling. The globe valve, on the other hand, opens and closes incrementally and is used to modulate flow levels, pressures, or temperatures. Both the gate valve and globe valve are commonly used in downstream applications. MRC Global maintains large inventories of gate valves and globe valves in materials such as carbon steel, stainless steel and special alloys to serve the needs of the refining, petrochemical, chemical and process industries.