Allweiler hose pumps type ASH in sizes 25-100 mm.

A hose pump is also called a peristaltic pump. The pumping action occurs when a strong, multi-layered hose is compressed by a pressure shoe and that compression is moved along the length of the hose. Hose pumps are usually defined by their hose dimension. Thus, an ASH 50 is a pump with a 50 mm internal hose diameter.

As a result of the compression, a large amount of friction occurs between the pressure shoe (or roller) and the hose. This friction is handled by a glycerine-filled lubrication ring between hose and pressure shoe. The pumping medium is only in contact with the inside of the hose. The pumping principle is unaffected by whether there is media in the pump or not.

The pump is highly pulsating, which must be taken into consideration during installation. The pump principle is also a relatively expensive solution per m3 of fluid pumped, both in terms of purchase and operating costs. In addition to the hose, which is relatively expensive, the pump also has a higher consumption of lubricant. In many cases, an Allweiler progressive cavity pump will be able to perform the same tasks more economically without pulsation and at a lower weight.

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