are available in many different design configurations needed to handle a great variety of fluids with different characteristics, temperatures and pressures. In addition construction materials play an important role in the struggle for ultimate corrosion resistance.

For the applications typical with our customers the following pump designs are available:


Centrifugal Pumps

A centrifugal pump is a rotodynamic pump that uses a rotating impeller to increase the pressure of a fluid. Centrifugal pumps are commonly used to move liquids through a piping system. The fluid enters the pump impeller along or near to the rotating axis and is accelerated by the impeller, flowing radially outward into a diffusor or volute chamber (casing), from where it exits into the downstream piping system. Centrifugal pumps are used for larger flows through smaller heads.  (taken from: Wikipedia)

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Gear Pumps 

A gear pump uses the meshing of gears to pump fluid by displacement. They are one of the most common type of pumps for hydraulic fluid power applications. Gear pumps are also widely used in chemical installations to pump fluids with somewhat higher viscosity. There are two main designs: external gear pumps which use two external spur gears, and internal gear pumps which use an external and an internal spur gear. Gear pumps are positive displacement meaning they pump a constant amount of fluid for each revolution.Some gear pumps are designed to function as either a pump or a motor. (taken from: Wikipedia)

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Rotary Vane Pumps

A rotary vane pump is a positive displacement pump that consists of vanes mounted on a rotor that rotates inside a cavity. In some cases these vanes can be variable length and/or tensioned to maintain contact with the walls as the pump rotates. It was invented by Charles C. Barnes of Sackville, New Brunswick who patented it on June 16,1874  (taken from: Wikipedia)

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Lobe Pumps

Lobe pumps are valveless positive displacement pumps with meshing lobes not in contact with each other. For vacuum applications they are manufactured with extremely close tolerances. They are used in industries like pulp and paper, chemical, food, beverage, pharmaceutical and biotechnology. They are popular in these industries because they offer superb sanitary qualities, high efficiency, reliability, corrosion resistance and good clean-in-place and steam-in-place characteristics. Lobe pumps can handle solids ( e.g. cherries, olives etc.), slurries, pastes besides ordinary liquids. If wetted they offer selfpriming performance. A gentle pumping action minimizes product degradation. They also offer continuous or intermittend reversible flows and can operate dry for brief periods of time. Flow is relatively independent of changes in pressure, so that output can be kept constant by but slight changes in speed. Flows go up to about 1000 m³/h depending on product viscosity.(taken from: Wikipedia)

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Progressing Cavity Pumps

A progressing cavity pump also called progressive cavity pump or eccentric screw pump is a type of positive displacement pump. It transfers fluid by means of the progress, through the pump, of a sequence of small, fixed shape, discrete cavities, as its rotor is turned. This leads to the volumetric flow rate being proportional to the rotation rate (bidirectional) and to low level of shearing being applied to the pumped fluid. Hence these pumps have application in fluid metering and pumping of viscous or shear sensitive materials. The cavities taper down towards their ends and  overlap with their neighbours, so that in general no flow pulsing is caused by the arrival of cavities at the outlet. Progressing cavity pumps are ideal for handling of thick, highly viscous and/or abrasive fluids like sludges, liquid manure, crude oil and fats.

As is common in engineering these pumps are often referred to by using a trademark e.g. Moineau (after the inventor René Moineau), Monopump, Moynopump, Mohnopump. (taken from Wikipedia)

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Plunger Pumps

A plunger pump can be used for liquid or gas, whereby gas will also be compressed. The plunger, oscillating in a cylinder, sucks the fluid in across the inlet valve during the suction stroke and expells it across the outlet valve during the discharge stroke. Plunger pumps are of the reciprocating positive displacement type.  In a plunger pump the high-pressure seal is stationary and a smooth cylindrical plunger slides through the seal. This makes it different from piston pumps and allows it to be used at high pressures. This type of pump is often used to transfer municipal or industrial sewage. (taken from Wikipedia)


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Diaphragm Pumps

A diaphragm pump can be used for liquids and gases. It works similar to a plunger pump, however, the flexible diaphragm replaces both, the plunger and the seal so as to obtain a hermetically tight pumping chamber. This avoids leakage of product into the environment and at the same time it prevents environmental impurities from entering the pump (e.g. germs that can affect products in pharmaceutical or food industry). The displacement of the diaphragm can be achieved either hydraulically, pneumatically or mechanically. The design and material of the diaphragms differ accordingly. Diaphragm pumps can also be called membrane pumps.

(taken from: Wikipedia)

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Peristaltic Pumps

A peristaltic or roller pump is of the positive displacement type, where the fluid is contained within a flexible tube fitted inside a circular pump casing. A rotor with a number of "rollers", "shoes", or "wipers" attached to the external circumference compresses the flexible tube. As the rotor turns the part of the tube under compression closes thus forcing the fluid to be pumped to move through the tube. Additionally, as the tube opens to its natural state after the passing of the cam, fluid flow is induced to the pump. The process is called peristalsis and can be found in many biological systems such as the gastrointestinal tract.

(taken from Wikipedia)

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Flexible Impeller Pumps

Flexible impeller pumps are of the positive displacement type with the impeller made of an elasto- mer. The impeller consists of a number of radial flexible vanes the outer diameter of which is larger than the inner diameter of the pump casing, so that the tips of the vanes are bent thus staying in close contact with the casing. As the impeller turns a cam between inlet and outlet port serves as a restriction which bends the vane passing by somewhat more so that part of the trapped liquid is squeezed out into the discharge line. Having passed the cam the vane opens up again and admits liquid from the suction line.

Flexible impeller pumps have excellent self-priming capability due to the close contact between the rubber impeller and the casing. On the other hand they are very sensitive to lack of liquid (dry running) which may damage the impeller after just a few seconds up to some minutes depending on pump quality. The high friction of the impeller in the casing means an important loss of energy, which is not available for transport of the liquid to be pumped.

Flexible impeller pumps are mostly used for cooling water on board of ships. In sanitary design, however, they are also used for foodstuff and beverages, because their self-priming capability reduces hygienically critical orifices in the system and the gentle pumping action does less harm to the products than centrifugal pumps (milk).

(taken from Wikipedia)

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