Houttuin twin screw pumps - The original design. The Houttuin geared twin screw pump is a rotary positive displacement pump which consists of two counter-rotating screw shafts. The screws on these shafts mesh together retaining a limited clearance and rotating freely inside the liner or pump casing bores. This creates a vacuum (under pressure) that causes the fluid to flow towards the pump. The pumped fluid enters through the suction inlet, the flow is divided and enters at the ends of the pump and travels to the centre of the pump and discharge. The centre part of the cylinders has an open connection towards the discharge. The torque is transmitted from the driver through the driven screw shaft to the short shaft by means of the timing gears. Both shafts are supported by bearings and are axially fixed at the non-driven end of the shafts. The bearings are not subjected to any load because of the hydraulic axial balance between the screws.
