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xxx 2011-03-22

Lower the boom on fuel usage and component costs

Lower the boom on fuel usage and component costs

Thanks to gravity, “Green Valves” from Rexroth both reduce fuel consumption and enhance boom controllability on cranes, telehandlers and other mobile equipment.

Rexroth introduces a new concept in load-holding and lowering valves to make mobile lifting equipment more energy efficient and easier to control. Using the force of gravity instead of engine power to retract a lift cylinder, Rexroth’s new "Green Valves" dramatically decrease power consumption thereby saving fuel and cutting emissions.

The idea sounds simple: Employ the force of gravity to lower a boom and its load instead of using the machine’s valuable supply of energy. However, this contradicts the traditional concept of load-holding and lowering valves.

Typically, to ensure both safety and precise motion control, it is necessary to literally push down the boom against a counterbalance valve. This requires engine power to build the pump pressure needed to pilot open the valve. It’s not uncommon to use 1000 psi and even up to 2500 psi in machines such as telehandlers, backhoe loaders, or cranes. This can result in power requirements of 70 HP or more, depending on parameters like cylinder position, speed of movement and the pilot ratio of the counterbalance valve.

Rexroth’s family of gravity-lower controls go one-step further, and all but eliminate the need for energy consuming high pressure and flow output from the pump. Engineered to replace traditional counterbalance valves, the patent-pending Green Valve design allows the use of gravity to help lower a loaded or unloaded structure, while at the same time providing increased stability and smoother start and stop of motion. In addition, Green Valve technology greatly reduces pump flow to the boom when lowering, making more flow available for faster execution of simultaneous movements and reducing machine cycle times for better overall performance.

By drastically reducing the energy demand on the diesel engine when lowering the boom, these new load-holding valves can provide significant fuel savings and help in meeting emission standards. A more efficient machine results in a more sustainable use of natural resources, which led to the product name, Green Valves.

Built on over 40 years of load-holding experience, Rexroth’s new Green Valves are assembled with field-proven components for maximum reliability. Suitable for any types of hydraulic circuit, Rexroth’s Green Valves are compact, easy to install, and interchangeable with many current Rexroth counterbalance valves.

Bosch Rexroth AG is one of the world’s leading specialists in the field of drive and control technologies. Under the brand name of Rexroth, the company supplies more than 500,000 customers with tailored solutions for driving, controlling and moving. Bosch Rexroth is a partner for industrial applications and factory automation, mobile applications and renewable energy.

As The Drive & Control Company, Bosch Rexroth develops, produces, and sells components and systems in more than 80 countries. In 2009 Bosch Rexroth, part of the Bosch Group, achieved sales of around $5.7 billion (4.1 billion Euro) with 34,200 employees. For more information, please visit:


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Susan  Strauss
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