Bosheng card 2XZ rotary vane vacuum pump is a double-stage high-speed direct-coupled rotary vane vacuum pump (hereinafter referred to as pump). It is eccentric in the pump chamber rotor, rotor slot and the rotor. Rotor driven rotation, the rotary vane close to the wall, the inlet and outlet separated, and the intake manifold chamber volume to periodically expand and inhale, the exhaust chamber volume is periodically reduced and compressed gas , Open the exhaust valve exhaust, to obtain a vacuum. Figure one for single-stage pump schematic diagram of the work. Two-stage is a series of two single-stage. 2XZ-type pump equipped with gas-operated valve, with extended pump oil usage time and prevent pump oil mixed effect. 2XZ pump with small size, light weight, low noise, easy to start and so on. In addition, there are measures to prevent the return oil (2XZ-8 without) and to prevent oil spill contaminated sites measures