水环 meaning in English

water ring

Methods of testing for water - ring vacuum pumps and compressors
水环真空泵和水环压缩机试验方法
Exploration to energy conservation of water - loop heat pump operation
水环热泵空调系统运行节能探讨
Application analysis of the water - circle heat pump air - conditioning system
水环热泵空调系统应用性分析
Working liquid circulation of water ring vacuum system for paper machine
纸机水环式真空系统工作液的循环利用
Water ring vacuum pumps
水环真空泵

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