The valve seal material can be Perfluoroelastomer or Viton, and it is designed to inflate after the valve segment is closed.

阀门密封材料采用全氟弹性材料或氟橡胶，在阀门关闭之后会充气膨胀。

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In some special occasions for metal hard seal butterfly valve seal put forward higher request, must be two-way under pressure.

在一些特殊场合对金属硬密封蝶阀的密封提出了更高的要求，必须双向承压。

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When the media in the current state, because of the medium pressure eccentric torque acting on disc, is not conducive to the valve seal.

当介质在逆流状态时，由于介质的压力作用于蝶板产生偏心力矩，不利于阀门的密封。

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The specialized tools built for the job allowed Dextre to seal the connections between the tool and the fuel valve to eliminate the possibility of leaks.

ENGADGET: Canada's Dextre robot refuels faux satellite from the ISS in first-of-a-kind test