The all-round rotary lobe pump for biogas plants
Rotary lobe pumps in the VX series for biogas applications

The biogas pumps of the VX series are the ideal solution for many pumping tasks in biogas plants. They reliably convey liquid manure, greases, flotation tailing and other liquid media – directly to the digester, the mashing tank or the liquid feeding system, or to digestate dewatering. The patented HiFlo® lobes enable pulsation-free and low-vibration pumping.

In many biogas plants, rotary lobe pumps from the VX series act as the central pump. They prime liquid manure out of pits, evacuating air from empty pipes in the process. Even if the liquid manure contains foreign matter such as stones and screws: thanks to the InjectionSystem and the large free passage, Vogelsang biogas pumps are resistant to foreign matter. Even organic suspensions, recirculate or low-viscosity digestate can be pumped without difficulty, e.g. from the digester to the post digester and vice versa: By changing the direction of rotation of the drive, it is easy to reverse the flow direction. This characteristic is also an advantage for tankers, as only one pump is needed for both filling and draining. The VX series stands out here thanks to its small space requirements: The biogas pumps can generally be installed easily on a vehicle or in the space between the digester and post digester.

Thanks to the QuickService concept, they can be serviced or repaired quickly and simply on site. All wear parts can be changed without dismounting and with limited space requirements, in order to restore 100% of the capacity.

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Brochure: Future-oriented biogas production

A biogas plant with Vogelsang VX rotary lobe pumps — Vogelsang VX rotary lobe pumps in a biogas application

VX rotary lobe pumps by Vogelsang on a biogas plant

Features of the VX series

On rotary lobe pumps from Vogelsang, wear on the pump housing segments is compensated without using additional parts. This makes the most of the material and prolongs service life.

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Axial wear plates are made from highly wear-resistant special steel and therefore extend maintenance intervalls. They offer protection for the entire pump chamber and therefore not only simplify maintenance, but also minimize downtime. At the same time costs are minimized.

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With our extensive selection of lobe geometry and materials, we will find the right long-life lobe for your media, e.g. NBR, NBR white, EPDM-SL, EPDM-AL, EPDM white, CSM, FKM, PU, stainless steel oder nitrided steel. The lobes can be produced in a straight, double-wing geometry or as 3-wing; 4-wing or 6-wing, pulsation-free HiFlo lobes.

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Alongside the standard model in abrasion-resistant gray cast iron, versions in ADI and stainless steel are stocked as well. On request, the components of the pump chamber can be manufactured from duplex steel or a nickel-based alloy. Other options for customization include heat treatment and wear-resistant coatings for the wear plates and housing components.

The Vogelsang Quality Cartridge stands for modern sealing technology. The mechanical seal in cartridge design is manufactured automatically in the factory, completely pre-assembled and checked by computer. This makes it quick and easy to change on site: assembly errors are avoided and the time required is reduced. This means quick and easy replacement of the shaft seal as well as safe commissioning after seal replacement.

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VX and GL pumps from Vogelsang have sturdy, break-proof shafts with a large diameter and without cranks and recesses to weaken them. The benefit is that Vogelsang rotary lobe pumps give a minimum shaft deflection even under high pressure, very low start-up wear, and ultimately reduced operating costs and spare parts costs.

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Vogelsang rotary lobe pumps of the VX and GL series are built according to a unique element-based design. With them, the customer isn’t forced to replace the entire body, but instead just the element that is affected. The economical replacement of individual components not only makes maintenance simpler and quicker, but simultaneously reduces the operating costs.

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Options of the VX series

The InjectionSystem significantly improves the foreign-matter resistance of the pump. It increases the efficiency and improves the suction capacity through optimized volumetric efficiency. Thanks to the InjectionSystem the service life of the pump is extended. Field trials prove a longer period of up to 2.5 times.

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The wear plates, made from highly wear-resistant special steel, extend maintenance intervals considerablx, simplify maintenance and minimize downtimes. Also your costs are significantly reduce during maintenance.

Unlike conventional rotary lobes, Vogelsang’s HiFlo rotary lobes ensure pulsation-free pumping and consequently longer lifetimes for the drive and coupling. At the same time, the suction capacity is increased due to the higher number of sealing lines. The improved internal sealing enables suction from deep pits.

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The speed-dependent displacement of the VX rotary lobe pumps makes them ideal for precise longitudinal distribution within the spreading swath. Either screwed directly into the gearbox or in conjunction with the UDS both versions of the Vogelsang speed sensor are used to calculate the flow rate, allowing precise control of the required spreading capacity.

The Universal Drive System (UDS) allows the same VX rotary lobe pump to be operated with a number of different types of drive (hydraulic and geared motors, classic cardan shaft, three-speed gearbox) or locations (stationary, mobile). This is done by combining the pump with a shaft and drive adapter. The UDS makes spare parts management easier and enhances flexibility.

In the QD design, an additional, third support bearing provides extra stability and extremely low shaft deflection, resulting in minimal pressure-related wear. This results in a longer lifetime and reduced wear, especially at high pressures.

Vogelsang’s rotary lobe pumps themselves are also compact in design, which saves weight. Also thanks to the pumping technique a considerable reduction in pipes is possible. Therefore Vogelsang rotary lobe pumps weigh up to 37 % less that comparable models on the market.

We offer another option which is perfectly suited to road transport: aluminum pump housing and lobe cores. This helps haulers to keep the tare of the transport vehicle to a minimum and thus increase the payload. The gearbox housing, bearing seal housing and QuickService cover are all made of aluminum. Particular attention has been paid to making sure that all components that come into contact with the medium are lined with robust gray cast iron or highly wear-resistant special steel.

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More on the product

Rotary lobe pump with InjectionSystem — The rotary lobe pump principle

Control cabinet - one option of Vogelsang control technology — Control technology

Media processed

Liquid manure	Organic suspension	Recirculate

VX biogas pumps in use

Case studies for biogas applications

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