Product Description
20
Houttuin 216 Series Pump -
Installation, Operation & Maintenance Manual
Product Description
General description
Product description
The Houttuin 216 Series geared twin screw pump is a rotary positive displacement pump which
consists of two counter-rotating screw shafts. The screws on these shafts mesh 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 center of the pump and discharge. The center 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.
Casing
– The casing is foot mounted with side -suction and top discharge nozzle. 216 series
are equipped with DIN EN 1092-1, PN16, PN25, PN64 / ASME B16.5 150lbs, 300lbs and
600lbs flanges. The solid cast body has thick cross sections for rigidity. Body passages are
designed to eliminate dead spaces to prevent liquid stagnation. Direct flow path from suction
opening to entrance of pumping screws has hydraulically wide open to improve efficiency and
NPSH behavior. The result is more uniform velocity changes for lower entrance friction losses
and consequently higher suction lift capabilities.
Liner
The field replaceable liner is manufactured in one piece with the material and surface
treatment selected specifically to match the metallurgy of the screws and the fluid being
pumped. The openings in the liner are engineered to improve NPSH behavior while at the
same time achieving the necessary rigidity in operation.
Screw/Shaft
Shafts and screws are manufactured as one robust integral rotor unit allowing for
maximum rigidity and stiffness. This minimizes shaft deflection, an important consideration in
high-pressure service. Screw block root diameter are reduced for greater displacement.
