Choke valve as the main parts of christmas tree and manifold, it is mainly used for controlling the net flow and its level of work pressure can be up to 15000 psi. Choke valve can be divided into adjust choke valve and fixed choke valve.

Fixed choke valve is the main parts of the wellhead and christmas tree equipment, through special tools to replace the size of the oil nozzle, and transform the throttling area of the liquid to control crude oil production of the wellhead.