Learning the differences between various sliding vane materials requires understanding how vanes function within a Blackmer Sliding Vane Pump.
The sliding vanes are located in the slots in the center of the pump’s rotor. Each vane is rectangular and features two center grooves, a leading edge, a trailing edge and a wear plate. The wear plates protect the backside of the vane from contact with pump models that feature a pushrod, with not all Blackmer vane pump models requiring the use of pushrods.
Sliding vane pumps operate when the rotor begins turning and the sliding vanes draw the liquid in behind each vane through the inlet port and into the pumping chamber. As the rotor turns, the liquid is transferred between the vanes to the outlet port where it is discharged as the pumping chamber is squeezed down. As the rotor turns, each of the pump’s vanes provides a positive mechanical push to the liquid ahead of it.
Three physical forces maintain the vane contact with the wall of the pumping chamber: (1) centrifugal force from the rotor’s rotation, (2) pushrods moving between opposing pairs of vanes and (3) liquid pressure entering through the vane grooves and acting on the rear of the vanes.
Each revolution of a sliding vane pump displaces a constant volume of fluid with any variance in pressure having a minimal effect. In addition, any energy-wasting turbulence and slippage are minimized, and high volumetric efficiency is maintained even as the vanes wear.