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　The vacuum feedthrough is a 　magnetic fluid-based high-　tech product and it works 　under the principle that 　magnetic fluid is injected to a 　magnetic field-built sealed gap 　to form a liquid sealing 　barrier. For realizing sealing 　effect, a computer seal is 　established in the to-be-sealed 　rotary shaft. It may introduce 　rotary movement into vacuum 　cavity or may be used in 　place of differential pressure.

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