Qingdao Zhongni Machinery Co.,Ltd is a leading manufacturer for vacuum pump and liquid ring vacuum pump/compressor with more than 10 years expoerience on vacuum application. We can provide customers with world-class high-quality products and all-around vacuum system solution. Every Zhongni vacuum pump is designed with full idea and can be widely used in chemical industry, petrochemical industry, power plant, paper, mine, food, and so on. All our pumps are 100% interchangeable with Siemens and NASH both on dimensi...