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Invention patent “Cryogenic big diameter magnetic liquid sealed device” (no. 200310113378.4)

"Cryogenic big diameter magnetic liquid sealed device" invention patent solved the problems such as cryogenic, big diameter sealed in the industry applications. This designed sealing device have advantages of low leak rate, long life time, reliable, no pollution, static sealed, high speed sealed, low viscous friction, low starting torque and smooth operation etc. It has been widely applied in multiple fields and made massive economic and social benefits.