Product category:
Pumps, Vacuum pumps
News Release from: Torqueflow-Sydex | Subject: Polyurethane pumps
Edited by the Processingtalk Editorial
Team on 15 October 2007
Polyurethane pumps for tough abrasive
applications
Traditional elastomers including Nitrile [NBR], Ethylene Propylene [EPDM] and Viton/Fluorocarbon [FKM] are all used successfully in today's progressing cavity pumps
Selection of the correct elastomer is just one aspect of ensuring reliable service, and good performance Nitrile is a good all round elastomer for various chemical and slurry applications, and tends to be the first choice for abrasive duties
This article was originally published on Processingtalk on 3 Dec 2007 at 8.00am (UK)
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Viton has excellent chemical resistance properties, but performance is reduced if the liquid contains abrasive particles.
When selecting a pump, fundamental consideration should always be given to rotational pump speed [rubbing velocity is the term used to describe oscillation - in the form of a sine wave - of the pump rotor with the stator], differential pressure and the number of pump stages ['slip' or 'backflow' over the seal line of contact points between rotor and stator increases with pressure and can cause wear].
The more the elastomeric stator can flex when sharp abrasive particles pass over it, the less wear occurs.
The ability of the stator to flex is significantly enhanced with Polyurethane, and tests carried out have given some very positive results.
Torqueflow-Sydex are now able to offer this excellent elastomer in virtually all of its pump range, giving enhanced reliability, service life and most importantly of all reduced running costs for its customers.
Polyurethane was first developed in the late 1930s as a replacement for rubber.
This new organic polymer was an ideal substitute for scarce materials, and spurred numerous applications.
Polyurethane coatings were soon used for the impregnation of paper, high-gloss airplane finishes and chemical and corrosion resistant coatings to protect metal, wood and masonry.
Formulations, additives and processing techniques continued to be developed and improved, and now polyurethanes can be found virtually everywhere in everyday life.
Polyurethane elastomers are incorporated in a multitude of diverse products such as thermoplastic polyurethane, cast elastomers and Reaction Injection Moulded (RIM) products.
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