Internal Gear Pumping Principle – How It Works

Viking Pump invented the internal gear pumping principle more than a century ago. The pump rotor (outer gear) is mounted to the shaft and rotates at slow speeds, turning the idler (inner) gear on the idler pin, mounted on the pump head. The gears open large voids between their teeth as they turn, creating low pressure zones that enable atmospheric pressure to flow chocolate in. As the gears re-mesh, the voids collapse and chocolate flows out the discharge port. Flow rate is directly proportional to speed, so variable speed drives can provide precise process control. Direction of flow is reversible, to strip material from the line after pumping.