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。
The shaft shall be hexagonal or square to ensure positive rotation of the disc and be totally sealed from exposure to the process liquid.
这类阀瓣具有不同的角度面对阀座，因此具有线接触作用，从而实现最大限度的密封。
Disc has a differential Angle front the seat to provide a line contact for maximum sealing.
并在理论上探讨将锥形阀瓣改为球形阀瓣，提高密封面的稳定性。
It also approach theoretically to change the conical valve gag into globe valve gag to raise the stability of the seal plate.
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