The shaft shall be hexagonal or square to ensure positive rotation of the disc and be totally sealed from exposure to the process liquid.

阀杆应该是六角形或方形，以确保阀瓣能够灵活旋转，并且完全密封，不会暴露在处理的液体里。

youdao

By changing the Angle of rotation of the disc can control the flow classification.

通过改变蝶板的旋转角度可以分级控制流量。

youdao

Objective To evaluate the therapeutic effect of rapid angulation rotation traction for lumbar intervertebral disc protrusion.

目的评估成角旋转快速牵引治疗腰椎间盘突出症的临床疗效。

youdao

There's some kids at the end of the rotation, but Phil Hughes is sidelined with a bulging disc, Ivan Nova pitched poorly down the stretch last season, and David Phelps is unproven.

WSJ: Yankees putting on Old-Timer's Day all season long