China University of Petroleum

Zhibin Fan

Yongwang Liu

Zhichuan Guan

Yucai Shi

Weixing Yang

Zhixiang Teng

Chenglin Fu

Zaiqiang Miao

A screw drill bypass valve comprising a valve body, the valve body is internally provided with a first-level valve core and a second-level valve core, a first-level spring is arranged between the first-level valve core and the second-level valve core, a second-level spring is arranged between the second-level valve core and a valve seat, and a rigidity of the second-level spring is greater than that of the first-level spring; the first-level valve core is provided with an inner bypass hole, the valve body is provided with an outer bypass hole, and the inner bypass hole is conducted with the outer bypass hole when a flowing pressure within a fluid channel of drilling fluid disappears; the second-level valve core is provided with an inner diversion hole, the valve body is provided with an outer diversion hole.

Screw drill bypass valve with large displacement diversion function

Growing community of inventors

Qingdao, China

Zhibin Fan