Manufactured under the Houttuin and Warren brands, the technology utilizes two intermeshing screws synchronized by a set of external timing gears that assemble into a tight-fitting figure-eight housing. The working principle employed is based on the non-contact concept of positive displacement (PD) pumps, which means using a combination of timing gears to prevent the screws from coming into contact with each other. Additionally, radial bearings orient the screw in the bore, allowing this technology to challenge the capabilities of many PD pumps in the industry with non-lubricated fluids.

Twin-screw pumps do not require contact surfaces and do not rely on fluid film support, and twin-screw pumps can be constructed from many different materials. They operate over a wide range of speeds while handling conventional and unconventional fluids with characteristics such as ultra-low and ultra-high viscosities, gas entrainment, contamination and corrosiveness.

The technology is particularly useful in industries where fluids are non-Newtonian, shear-sensitive, have high vapor pressures, vary in viscosity, and where the process uses solvent flushing, heating, batching or drainage.

Main uses: Warren and Houttuin pumps are used worldwide in the chemical and petrochemical industries, tank farms, power plants, offshore, refineries, shipbuilding and marine, soap, food, beverage, plastics and sugar industries.