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介绍水泵无底阀吸水时两种主要发式，即喷射系和真空罐吸水方式的结构原理，并持别介绍了真空罐式无底阀吸水方式的优点，具有较高时推广价值。
This paper introduces the structure and principle of the two major hairstyles when water pump without bottom valve absorbs water, that is, the principle of water absorption of jet system and vacuum tank, and introduces the advantages of vacuum tank type without bottom valve to absorb water.