Now generally used PTEE, EPDM and other material for the valve seat, so bubbles leakproofness good.

现一般均使用PTEE 、 EPDM等材料,为阀座, 因此,气泡密封性佳.

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Especially in automobile industry, the leakproofness of cylinder influences the performance of auto car directly.

特别是在汽车行业, 能否保证汽缸的气密性,直接影响着汽车的性能.

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