Houttuins original design provided the blue print for todays twin screw positive displacement rotary pumps. Based on the Archimidean principle, two intermeshing screws on parallel shafts operate inside a close fitting......Houttuins original design provided the blue print for todays twin screw positive displacement rotary pumps. Based on the Archimidean principle, two intermeshing screws on parallel shafts operate inside a close fitting, 8-shaped liner. Liquids are pumped from both ends into the pumps centre body where the discharge is located. The long shaft through a set of external precision timing gears drives the short shaft. Houttuin twin screw pumps feature a clearance between the screws. The major advantages of this design are: less wear on the screws less chance of liquid contamination reduced risk of damage