Materials Handling
developed that ensures a uniform wall thickness without the need for secondary machining and this significantly extends the service life of the hose.
Paper manufacturing As well as its traditional markets, the peristaltic pump is also making its presence felt in other applications. For example, in paper manufacturing where wastewater contains fibrous residues, fillers and chemicals. As the fluid tends to clog when only low flow rates are needed, the efficient working of other pump types is compromised. The low maintenance credentials of a peristaltic pump make it the perfect choice. When the fluid clogs at the suction side, as can happen easily with this application, the simple reverse action of the rotor is the easy solution to the problem. Verderflex also points to ink handling as another growing
application area. A good example in this sector comes from a packaging company that had been using air diaphragm pumps to transfer ink from storage containers to printing machines. However production problems were resulting from the existing pumps’ inability to handle the water-based ink gently enough. As a result, bubbles formed in the ink, ruining the
packaging, creating waste and adding expense. A compact peristaltic hose pump proved to be the ideal solution. Ink is dosed gently, eliminating bubbles and as the ink is completely contained within the pump’s hose throughout the process there is no mess or wear to moving parts. Colour change is quickly accomplished as the hose is easily exchanged. The pump itself can even run dry without fear of damage. Another is in yeast pumping, where pumps with a high
shear-rate can damage the fragile product. Yeast is also very abrasive and if it is producing gas, can also lead to vapour locks. Peristaltic pumps have no problem with any of these issues.
Wider peristaltic applications For its part, Eccentric Pumps has created what it describes as a new revolution in peristaltic hose pump design. Its novel approach to building hose pumps employs a single oversized roller that compresses a highly-engineered, low-friction hose through more than 360° of rotation. The company’s peristaltic hose pumps are used at
municipal and industrial sites wherever fluids are metered, dosed, or transferred from one place to another. Customers solve wide-ranging and complicated problems such as handling bleach, corrosive and abrasive slurries, acids, alkali, colourants, inks and other difficult-to-pump solutions. Eccentric’s peristaltic hose pump products provide more
flow per revolution and only one compression and expansion per cycle. At equal performance points, the Eccentric Pumps peristaltic hose pump runs slower, and the hose lasts longer than pumps with multiple shoes or rollers. This, says the company, gives it a number of other big advantages, including more than 50 per cent more flow per revolution than conventional designs, and cooler running than other hose pumps. There are performance benefits, too, including a high
vacuum for suction lift applications, relatively high discharge pressures, and a compact footprint. ■
HOmatic pinch valves: Innovation and quality that will pay off
VALVE ENGINEERING
HO-Matic AG Alte Obfelderstr. 55 CH-8910 Affoltern a. A. Phone: +41 (0)43 322 70 80 Fax: +41 (0)43 322 70 88 E-mail:
info@ho-matic.ch www.ho-matic.ch
Circle 33 or ✔ at
www.engineerlive.com/epe
HOmatic pinch valves: Ideal closing and measuring of bulk goods, liquids and gases
Q.S.V. EP patent
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