Pumps Pumping Abrasive Media? Take it Easy!

Editor: Dominik Stephan

Handling demanding media just got easier: A new pump technology expands the range of applications — A technology that till now was only available for the continuous operation with expensive process pumps makes its debut on the mass market: A new double hose-diaphragm pump provides in-built compressor and bypass flow control for pressure ranges up to 16 bar.

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Pressure gradient with 15 bar (simplex pump, flow rate 2.5 m³/h, air vessel capacity 10 liters)
Pressure gradient with 15 bar (simplex pump, flow rate 2.5 m³/h, air vessel capacity 10 liters)
(Source: Feluwa)

Up to now, only a limited selection of energy and wear-intensive pump technologies was available for the conveyance of abrasive slurries in process engineering industry or for aggressive fluids in chemical industry for low pressure ranges below 16 bar. The Ecotrans Multisafe pump design is regarded as real alternative to traditional air-operated diaphragm pumps and rotating displacement pumping systems.

The demand for an energy-efficient, low-maintenance technology saving operating costs inspired pump experts Feluwa to develop the Ecotrans Multisafe double hose-diaphragm pump. This new unit provides an economical technology for low pressure ranges, which till now was only available for large process pumps.

The Ecotrans product range represents the latest generation of hydraulically-activated double hose-diaphragm pumps, a type of pump that is particularly well suited for critical applications, mechanically abrasive and chemically aggressive liquids, as well as highly viscous media (even with particles) of different consistencies. Depending on the respective medium, the dry-matter content can be up to 80 %.

Air Supply Already Included

The pumps operate as a stand-alone system. The in-built piston compressor omits the need for any external media supply in the form of compressed air, water, etc., except the power supply for the electric drive. The high efficiency and long service life of the hose-diaphragms reduce the operating and maintenance costs to a minimum.


The hose-diaphragms themselves, which are usually not considered a wear part when compared to conventional flat diaphragms, are designed for a service life of more than 20,000 operating hours. If utilized correctly, the costs for spare parts amount to 2 % of the acquisition costs (CAPEX) per year.

The Gravity Effect

The pumps mode of action is based on an oscillating piston, which periodically increases or decreases the inner pump or working space of the outward hermetically sealed hose-diaphragm by means of hydraulic fluid. Suction and discharge lines are alternately connected to the inlet and outlet valves. The displacement mechanism performs a simultaneous suction and discharge stroke during each stroke. During the suction stroke, a respective amount of liquid will pass through the suction pipe into the pump working chamber through the opened suction valve. During the discharge stroke, the conveyed liquid is displaced into the discharge pipe through the now open valve, while the suction valve seals the suction side.

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