Throttling Valves are designed in accordance with the requirements of API Spec 6A and API Spec 16C. According to the types of structure, we have adjustable throttling valve and fixed throttling. According to the principle of action, we have manual throttling valve and hydraulic Throttling Valve. According to the function, we have Needle Throttling Valve and Cylindrical Throttling Valve. The valves are used to adjust flow rate of Wellhead, and control the flowing casing pressure of Kill & Choke Line Manifold. The valve cup and valve core are made of carbide, so the corrosion, abrasion and erosion resistance and easy access to operation are available.