Stephenson & co has launched sshuttle block pumps which employ a unique pumping principle a combination of rotary and piston pump. The shuttle block pump is a self-priming rotary pump. There arewhere there is only three pumping elements-rotor, piston and shuttle. The rotor is keyed to a single shaft and runs concentric in the pump casing. Like a true piston pump, this pump can handle highly viscous liquids or thin volatile material with unmatched stiction characteristics and yet smoothly without pulsation. This pumping principle-unrlike centrifugal or gear pumps-gently handles the product without breaking it down, emulsifying, foaming, chewing or heating. Such a simple construction has resulted in extremely rugged and maintenance-free pumps with very low noise levels. Most of the difficult pumping problems can be overcome by a shuttle block pump. Some of the common, applications handled by shuttle block pumps are: unloading of tankers, rail wagons, transfer of edible oil, fuel oil, soap liquor, sodium silicate, bitumen, etc.
