Spool valve multi-stage pump outside the eccentric rotor is equipped with a spool, the rotor rotates the slide valve slide along the inner wall and scroll, slide the upper part of the spool valve slide in the slide valve slide, and the more The pump chamber is divided into two variable volumes. Sliding valve multi-stage pumping principle and rotary vane pump similar, but the two different structures. Slide valve pump is the use of slide valve body to change the suction chamber volume, it is called multi-stage pump.
