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A type of check valve, typically installed in the tubing hanger, to isolate the production tubing. 单向阀的一个类型，通常装在油管悬挂器中，以隔离生产油管。 www.infopetro.com.cn
It is composed of casing flange, casing cross joint, wellhead valves, tubing hanger, tubing head cross joint and accessories. 这种井口装置由套管法兰、套管大四通、井口阀、油管挂、油管挂体及相关附件组成。
The seals of tubing spool and tubing hanger are classified as two types:vertical rubber seal and tapper metal seal. Users can select one of them upon their requirement. 油管四通和油管悬挂器分两种密封结构形式，一种是直 座式橡胶密封，一种是 锥 座式金属硬密封，可根据不同需要确定其选用形式。