ocr: ROTARY VANE PUMP OUTLET VANE INLET ROTOR. / - - COMPARTMENTI This pump consists ofa an off-center rotor that has slots fitted with sliding vanes. When the rotor spins, the vanes are thrown against the wall ofthe pump. They create compartments that get smaller toward the outlet, where the fluid is squeezed out at high pressure. Rotary vane pumps often deliver gas at filling stations.