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Soda combined jet vacuum pump is a steam jet pump in the first stage after the first condenser in series with a cascade of jet vacuum pump and composition. Soda combined jet vacuum pump to overcome the shortcomings of the steam jet vacuum pump and water jet vacuum pump to play their advantages, both to achieve a higher working vacuum, but also have a larger pumping capacity, than the traditional multi-stage steam jet vacuum pump Saving more than 50% of the working steam, saving more than 30% of the cooling water, without the need to start the pump, pumping tower time is short.