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Hydraulic filter elements

Bosch Rexroth has introduced a new range of hydraulic filter elements incorporating new materials that deliver optimum performance while reducing operating costs through increased service life.

 The new range of elements, known as Pure Power, has been designed using new micro-glass material to retain 50 per cent more contaminant particles than the range it is replacing. This is due to the very small diameter of the micro-glass fibres allowing for more interstitial spaces in the same given area to trap and retain contamination.

The micro-glass main filter layer assists in achieving optimum retention rates. In order to meet the requirements of ISO 16889:2008 (the international standard for evaluating filter performance), any filter element must have a ß-value exceeding 200, depending on the filter particle size rating. The ß-values of the new Pure Power filter material have exceeded 1,000 in real world tests. This maximises system availability as hydraulic fluids are optimally cleaned. It also prevents damage to the system and further contamination by removing a very high proportion of the contaminants in the first pass through the filter.

This is also the first time that a manufacturer has fitted all elements in its range with an additional antistatic conductive woven filter medium as standard. This creates a charge exchange between oil and filter material and so reduces the risk of electrostatic charge and discharge in the filter. 

End users of hydraulic systems increasingly use zinc- and ash-free oils which typically have reduced conductivity. If this is less than 300 picosiemens per metre, the danger of electrostatic discharge increases. Discharge processes are often visible in the form of lightning discharges or they can be identified by a sizzling noise. Each discharge can burn tiny amounts of oil and reduce the service life of the medium. Discharges can also burn holes in the filter layers. This reduces the retention rate and increases the danger of particles passing through the filter and causing damage in the system. The antistatic conductive woven filter medium helps negate the risk of these issues.

As well as high filtration efficiency, the new material also increases the dirt-holding capacity of the filter. Compared with previous generations of products, the new filter elements typically absorb up to 50 per cent more particles, thus prolonging service life by the same value under the same operating conditions. This reduces the costs of filter elements, their disposal and associated labour, and equipment downtime. The effect is even more pronounced when used with Rexroth filter housings with patented Cycloclean cyclone technology, where a doubling in dirt-holding capacity has been measured according to the ISO16889 multi-pass test, while retention capability increases tenfold using the same test. This is a direct result of the cyclone design maximising filter capacity by effectively pre-filtering the fluid.

Chris Gray, project manager filtration at Bosch Rexroth, said: “Hydraulic fluid contamination remains the primary cause of system failures, so the need to optimise filtration performance is vital. Our new filters draw on state-of-the-art materials technology and our extensive industry experience to deliver long service life and optimum performance in a broad spectrum of industry applications.”

Bosch Rexroth

Economical, precise, safe, and energy efficient: drive and control technology from Bosch Rexroth moves machines and systems of any size. The company bundles global application experience in the market segments of Mobile Applications, Machinery Applications and Engineering, and Factory Automation to develop innovative components as well as tailored system solutions and services.

Economical, precise, safe, and energy efficient: drive and control technology from Bosch Rexroth moves machines and systems of any size. The company bundles global application experience in the market segments of Mobile Applications, Machinery Applications and Engineering, and Factory Automation to develop innovative components as well as tailored system solutions and services. Bosch Rexroth offers its customers hydraulics, electric drives and controls, gear technology, and linear motion and assembly technology all from one source. With locations in over 80 countries, more than 33,700 associates generated sales revenue of approximately 5.6 billion euros in 2014.

The Bosch Group is a leading global supplier of technology and services. It employs roughly 360,000 associates worldwide. The company generated sales of 49 billion euros in 2014. Its operations are divided into four business sectors: Mobility Solutions, Industrial Technology, Consumer Goods, and Energy and Building Technology. The Bosch Group comprises Robert Bosch GmbH and its roughly 440 subsidiary and regional companies in some 60 countries. Including its sales and service partners, Bosch is represented in roughly 150 countries. This worldwide development, manufacturing, and sales network is the foundation for further growth. In 2014, Bosch applied for some 4,600 patents worldwide. The Bosch Group’s strategic objective is to create solutions for a connected life. Bosch improves quality of life worldwide with products and services that are innovative and spark enthusiasm. In short, Bosch creates technology that is “Invented for life.”

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