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circulating water multipurpose vacuum pump is the latest designed vacuum pump model with circulating water as working fluid, and it adopts jet technology to create negative pressure. it is not only a kind of vacuum suction device, but also supplies cooling water to the reaction device at the same time. it has the non-oil, free-pollution, anti-corrosion, low noise, easy to move and so on features. according to the appearance is divided into desktop type and vertical type