由于通路正常位置，或说静止位置阀位为关闭状态，所以能够根据实际需要，在井眼任意位置以任意频率循环井内管柱，且不需要永久性拆卸工具。

Because the normal, or neutral, position of the ports is closed, the running string can be circulated as often as necessary, at any point in the wellbore, without permanently deactivating the tool.

youdao