Vane pumps are used in a wide variety of applications. It is ideally suited for low-viscosity, non-lubricating liquids up to 2,200 cSt / 10,000 SSU. Such liquids include LPG, ammonia, solvents, alcohol, fuel oils, gasoline, and refrigerants. These pumps are available in a number of vane configurations including sliding vane, flexible vane, swinging vane, rolling vane, and external vane. Vane pumps are noted for their reliability, dry priming, easy maintenance, and good suction characteristics. A slotted rotor or impeller is eccentrically supported in a cycloidal cam. The rotor is located close to the wall of the cam so a crescent-shaped cavity is formed. The rotor is sealed into the cam by two side plates. Vanes or blades fit within the slots of the impeller. As the impeller rotates and fluid enters the pump, centrifugal force, hydraulic pressure, and/or pushrods push the vanes to the walls of the housing. The tight seal among the vanes, rotor, cam, and side plate is the key to the good suction characteristics common to the vane pumping principle.