JZJ2B Series Roots-water Ring Unit is a vacuum pump composed of ZJP Roots pump as the main pump and 2BV/2BE1 series water ring pump or Roots-water ring unit as the front pump. In addition to being used to pump out general gases, it can also pump out gases containing moisture, organic solvents or a small amount of dust. Compared with general mechanical vacuum pumps, it is not afraid of oil pollution, water vapor and dust, and compared with general water ring vacuum pumps, it has the characteristics of high vacuum and high pumping speed under high vacuum conditions. JZJ2B series vacuum unit adopts high efficiency and energy saving 2BV series water ring pump is used as the fore pump, so JZJ2B series vacuum unit has the advantages of high efficiency, compact structure, no leakage (2BV pump is mechanical seal design, different from 2SK series packing seal), corrosion resistance (2BV uses stainless steel or aluminum bronze impeller), high protection level, etc. Roots vacuum pump adopts ZJY series Roots vacuum pump developed by our company. The company improves the seal of pump cavity and bearing cavity, so that the pump oil of ZJY series Roots vacuum pump is not easy to emulsify in the process of extracting large amount of water vapor and various solvents.