B-tween impeller design

The new impeller from PXPUMPS is designed to meet extraordinary demands from the municipal water works and heavy duty industries for the 21st century. The design is based on more than 40 years of experience in the solid handling pump industry.

The new impeller design is a unique innovation. It combines all the features of a high efficient and large solid handling channel impeller with the strengths of an open vortex with none clogging capabilities and wear resistance.

But the new development goes further than that. Any other type of solid handling impeller on the market is affected by the wear that decreases the efficiency over time. The new PX4 series impeller does the opposite; it increases the hydraulic pump efficiency as the pump wears.

We call it B-tween® to stress that our new impeller is the optimal combination between a channel and a vortex impeller.

Efficiency increases when the pump wears

B-tween is based on two open channels with vanes of a very large radius. The vanes end in a horizontal edge which turns against a stationary impeller wear plate. As larger clearance between the two surfaces appears, the efficiency increases as the growing flow helps pumping.

The clearance is set on a specific distance that makes the pump operate in normal wastewater applications with sand and solids for years without any adjustments or part exchange. The wear keeps increasing the efficiency up to a point that it normally takes years to reach. When this critical point is reached, the “wear plate” can be adjusted or even replaced if necessary.

Field & lab tests prove non clogging capabilities

The none clogging capabilities is the most valuable single demand of a submersible wastewater pump. The new B-tween impeller has taken all the steps necessary to achieve this goal. The design is tested over and over again in different extensive field installations and laboratory clogging tests have been done in hundreds.

There are two major factors in a none clog impeller design: the liquid velocity through the vanes and the throughlets where the solids can pass. The B-tween impeller does not deviate from these basic rules. Throughlets of 100mm (4”) and more on some models enable the B-tween impeller to handle bottles, cans, tennis balls etc. When it comes to textiles and fibrous materials the extreme liquid velocity through the vanes handles the solids with pride.