*Choke Valves are designed in accordance with the requirements of API Spec.6A and API Spec.16C. *They are classified into Adjustable Chokes and Positive Chokes according to structural features, and classified into Manual Choke Valves and Hydraulic Choke Valves according to working principles. Flow beans for Positive Chokes, stems of Adjustable Chokes, valve cores and seats are all fabricated from carbide alloy, so they have features of resistance to corrosion and erosion, working reliability. Adjustable Chokes have needle type and barrel type. *The former are mainly used in wellhead and X-mas tree assembly to control the flow rate of fluids, and the latter are mainly used in Choke and Kill Manifold to control casing pressure of wellbore fluids.
