When the handwheel is rotated to the closed position the upper stem pushes on the diaphragms, which deflect downward, forcing the lower stem against the valve seat.
英
美
释义
当手轮旋转到关闭位置,上阀杆推动横膈膜,横膈膜下垂,迫使下阀杆接触阀座。
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