Common roots vacuum pump can not be used individually,it must be used after being assembling set with fore-pump.roots water-ring vacuum unit set is the whole set equipment to achieve vacuum,water ring vacuum pump for the fore-pump complete sets of vacuum access to equipment .with these vacuum meter and control equipment,assembiling set can achieve automatic operation ,overheat and
overload protection.According to different process requirements,roots vacuum unit can constitute multi-stage roots vacuum
assembling set with one or more roots vacuum pump and water ring vacuum pump.