根据需要可分为套管螺纹循环接头和油壬螺纹循环接头(全规格)。
According to actual needs. there are circulating sub with casing thread and circulating sub with union thread.
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.
在输入电子平衡和XLR接头，用于循环的信号直接输出，同时还实施标准。
The inputs are electronically balanced and implemented on XLR connectors, whilst Direct Outs for looping the signal are also standard.
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