Vickers Vane Pump explanation: The action principle of the double-acting vane pump is similar to that of the single-acting vane pump. The only difference is that the stator surface is composed of two long-radius arcs, two short-radius arcs and four transition curves. Partially composed, and the stator and rotor are concentric. When the rotor rotates clockwise, the volume of the sealed working chamber gradually increases in the upper left and lower right corners, which is the oil absorption zone, which gradually decreases in the lower left corner and the upper right corner, and is the oil pressure zone; the oil absorption zone and the oil pressure zone. There is a section of oil seal between the zones to separate them. The rotor of this kind of pump rotates once every revolution, and each sealed working chamber completes the oil absorption and oil pressure action twice, so it is called double-acting vane pump. The two oil suction zones and the two oil pressure zones of the pump are radially symmetrical, and the hydraulic pressure acting on the rotor is radially balanced, so it is also called a balanced vane pump.
The instantaneous flow of the double-acting vane pump is pulsating, and the pulsation rate is small when the number of vanes is a multiple of four. For this reason, the number of blades of the double-acting vane pump is generally 12 or 16.