闸板和阀座的接触表面必须光滑、平整，才能有效地密封。
Contacting surfaces of the gate and body seats must be smooth and flat for effective sealing.
这种密封实际上并不接触轴的表面，它的密封原理是将聚合物冷却到半熔融状态而形成自密封。
This fact does not contact the shaft seal surface, it is the sealing principle of polymer cooled to half molten state and forming the seal.
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