该改进的轴承是环形的，具有与悬挂接头的壳体或可移动的承窝的内部相配合的外部尺寸。
The improved bearing is annular, having an outer dimension sized to seat within the housing of a suspension joint or movable socket.
本发明的管接头采用由两个弧形壳体铰链连接结构的开口环形外壳，打开、合拢极为方便。
The pipe connector of the invention adopts the opening annular outer case with the structure connected by two arc-shaped case body hinges, and can be conveniently opened and closed.
循环接头在工作时在工具管柱的上段打开通向环形空间的通路，于是能够建立较大的循环流量。
When operated, the circulation sub allows a higher circulation rate to be established by opening a path to the annulus in the top section of the tool string.
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