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FEATURE HYDRAULICS & PNEUMATICS


KEEPING THINGS FLUID: The importance of best practice in hydraulic fluid selection


Bosch Rexroth has restated the importance of choosing correctly rated hydraulic fluids to optimise performance and safety in mobile applications


osch Rexroth issues its own Fluid Rating List, recommending the most appropriate high-performance fluids for use with its hydraulic pumps and motors. This complements the requirements of international standards ISO6473-4 and ISO4006. Hydraulic fluids perform multiple tasks, including power transmission, lubrication, friction and wear reduction, and minimising the effects of heat and contaminants. Kevin Follows, technical support


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manager for mobile applications at Bosch Rexroth, explains: “There is an enormous range of hydraulic fluids on the market but not all of them are suitable for every application. Many are mineral oil-based but specifiers can also select from monograde, multigrade, anti-wear and fire-resistant oils. The varying components of fluids perform a


multitude of tasks in protecting the system, optimising safety, performance and longevity. However, each product is designed to function optimally under certain conditions and in tandem with particular components - so specifiers would be well advised to ensure the correct product is chosen, or risk potentially costly and disruptive production issues down the line.” Follows lists viscosity, operating


temperature, environmental factors, manufacturers’ recommendations and materials compatibility, as the key criteria on which the fluid selection decision should be based. He continues: “Flow resistance and thermal conductivity are vital, while the effects of leakage or spillage must always be considered in these times of heightened environmental concern. Meanwhile,


Hydraulic fluids perform multiple tasks, including power transmission, lubrication, friction and wear reduction, and minimising the effects of heat and contaminants


taking the time to understand the applications for which the fluid has been designed will go a long way towards ensuring optimal product selection. “Combined with a clean system, a proper start-up procedure, appropriate filtration, regular condition monitoring and oil change, the chosen fluid will then invariably deliver to the expectations of the user.”


Bosch Rexroth www.boschrexroth.com


Flexible couplings for diesel hydraulic drives


Mechanical power transmissions manufacturer Centa Transmissions has launched a new addition to its range of flexible couplings for diesel hydraulic drives


several steel and reinforced plastic options on the output side. The coupling can be plugged in axially for easy mounting and, with the benefit of high specification design and low cost, the new CENTAX-K is an impressive addition to the hydraulic pump drive range. It is available in three sizes and covers torques ranging from 400 to 800Nm. This new coupling follows the recent


The new CENTAX-K range, a torsionally- soft coupling designed for diesel-driven compressor, pump or hydraulic drives, features a rubber element that is vulcanised to a steel adapter plate with


10 JUNE 2017 | DESIGN SOLUTIONS


CENTAX-K flexible coupling for


compressor, pump or hydraulic drives


launch of the single piece, torsionally-stiff CENTAFLEX-KF, a stronger yet thinner lightweight flexible coupling offering construction plant operators more flexibility and superior stiffness.


Centa manufactures and supplies a


wide variety of flexible couplings, shafts and other power transmission products to suit diesel engine-driven industrial applications where the elimination of misalignment, vibration, noise, or even, weight reduction, is required. Centa has the ability to engineer a bespoke engine drive to your specification, as well as supplying individual replacement couplings from stock.


Centa Transmissions T: 01274 531034 www.centa-uk.co.uk


/ DESIGNSOLUTIONS


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