Zhengzhou LiHao vacuum equipment co.ltd, was founded in 2006(formerly the Zhengzhou general vacuum pump ) ,since the restructuring and reorganizing in 2009, committed to the vacuum equipment research and development, and production, have a first-class manufacturing equipment with a complete quality assurance system,which is the professional domestic vacuum and vacuum application equipment manufacturers, mainly production of biogas vacuum pumps, water ring vacuum pumps and compressors, rotary ...