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xxx 28-10-2011

Lock and lower: Boom lock safety with expanded control: VBCN-R series boom lock valves give full range lowering control to safety compliance load-holding devices

Lock and lower: Boom lock safety with expanded control: VBCN-R series boom lock valves

The reliability and safety of Rexroth’s market-leading boom lock valves is now enhanced to provide full-range, pilot controlled lowering speed regulation.

Rexroth’s VBCN-R series of gravity lower load-holding devices, commonly called “boom lock valves,” gives machine builders the opportunity to refine control systems with the combination of two functions in one valve. The load lowering and hose burst safety compliance demanded by such regulations as ISO-8643 / EN-474 can now be supplemented with full-range lowering speed control in the VBCN-R valves.

Whether in earth moving, scrap handling or excavator attachment applications, for over 30 years users have appreciated the low-speed precision lowering control of Bosch Rexroth’s VBC series load-holding valves. This precision can now be realized across the full range of boom lowering speed without sacrificing the hose-burst response characteristics that ensure compliance with relevant safety regulations (after proper set-up and test.) In the past, the main directional valve controlled high-flow speeds, and the load-holding plus directional valve combination required “tuning” for optimum performance and safety compliance. The new VBCN-R series eliminates the need for highly synchronized opening of the two valves.

The combination of low-hysteresis speed control, load limiting over-pressure protection and hose-burst safety in one single valve both streamlines the machine development process and provides cost-saving opportunity by potentially reducing directional valve spool cost. Energy savings are achieved through the low-side oil reclamation system of the VBCN-R valves. This functionality permits lowering with minimized oil supply from the pump, therefore allowing simultaneous functions, such as dipper and bucket cylinders, to operate with minimal horsepower draw on the engine and with decreased cycle times.

Rexroth’s VBCN-R family of valves are designed for flow rates to 120 gpm and 6000 psi, however even higher flow rates can be achieved with customized solutions. Safety and precision, the ability to lock securely and lower smoothly and accurately, are values all machine operator’s prize – values Rexroth’s VBCN-R valves have the potential to maximize for all machine manufacturers.

Bosch Rexroth Canada is the Canadian subsidiary of Bosch Rexroth AG, one of the world’s leading specialists in the field of drive and control technologies. Under the Rexroth brand name, the company supplies more than 500,000 customers with tailored solutions for driving, controlling, and moving. Bosch Rexroth is a partner for Mobile Applications, Machinery Applications and Engineering, Factory Automation and Renewable Energies. The company provides customized solutions tailored to the needs and specifications of each individual market. As The Drive & Control Company, Bosch Rexroth develops, produces, and sells components and systems in over 80 countries. As part of the Bosch Group, Bosch Rexroth and its 34,900 associates generated approximately 5.1 billion euros in revenue in 2010.

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The Bosch Group is a leading global supplier of technology and services. In the areas of automotive and industrial technology, consumer goods, and building technology, some 285,000 associates generated sales of 47.3 billion euros in fiscal 2010. For 2011, the company forecasts sales of more than 50 billion euros ($70 billion) and a headcount of 300,000 by the end of the year. The Bosch Group comprises Robert Bosch GmbH and its more than 350 subsidiaries and regional companies in over 60 countries. If its sales and service partners are included, then Bosch is represented in roughly 150 countries. This worldwide development, manufacturing, and sales network is the foundation for further growth. Bosch spent 3.8 billion euros for research and development in 2010, and applied for over 3,800 patents worldwide. With all its products and services, Bosch enhances the quality of life by providing solutions which are both innovative and beneficial.

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