PI 027-16 Lohr am Main, 2016-04-11

New control block for wheeled loaders and dozers: energy-efficient with high pressure

Around ten percent smaller size with a higher pressure level. The new control block from Rexroth is designed for operating pressures of up to 380 bar.

Flow sharing control block (LUDV) RS15WL from Rexroth with significantly increased functional diversity

The new modular control block RS15WL from Rexroth offers significantly improved energy efficiency thanks to reduced pressure losses along with all the advantages of a load pressure-independent flow control (LUDV). With a significantly increased pressure level and greater range of functions, it is specially designed for the requirements of implement hydraulics in dozers and wheeled loaders up to 16 tons.

Thanks to a reduction in pressure losses of up to 40 percent compared to the preceding M6-15 generation, the new central control block in sandwich plate design increases significantly the energy efficiency of implement hydraulics. This reduces the diesel consumption and the corresponding exhaust emissions of wheeled loaders and dozers. Simultaneously, the new control block supports the vehicle manufacturer on the way towards higher pressures. RS15WL is designed for operating pressures of up to 380 bar and a maximum pressure of 430 bar. This allows designers to create a slimmer stroke and tip cylinder, thus saving installation space. The control block is fully compatible with axial piston pumps A11VO from Rexroth.

The LUDV control block is suitable for circuits with a pump displacement of up to 200 l/min. If this flow is insufficient to supply all consumers with the desired amount, the LUDV function slows down all movements at the same rate - but no consumer stops. This increases safety and operating convenience.

The modular layout with disc segments increases flexibility for the application-specific realization of diverse functions. The high-performance regeneration of up to 100 percent improves control during simultaneous movements and reduces energy consumption. It also supports faster stroke lowering with different loads without cavitation, as well as faster forward tipping with parallel kinematics. In addition, the control block optimizes the "power lowering", whereby the dozer blade remains in contact with the ground.

Other functions reduce shovel vibration while driving and fulfill the high requirements of load holding. An integrated priority valve reliably supplies the steering and a flushing valve prevents piston jamming by compensating for differences in temperature.

A "load sensing" pressure limitation protects pumps and steering against pressure peaks. The integrated pilot pressure generation is deactivated with a cut-off valve during road use. A second cut-off valve controls an external component, such as a parking brake. Despite the significantly higher pressure level and the extended range of functions, the new control block has an installation space around ten percent shorter than its predecessor.

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.

To learn more, please visit

The Bosch Group is a leading global supplier of technology and services. It employs roughly 375,000 associates worldwide (as of December 31, 2015). According to preliminary figures, the company generated sales of more than 70 billion euros in 2015. 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 subsidiaries and regional companies in some 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. In 2015, Bosch applied for some 5,400 patents worldwide. The Bosch Group’s strategic objective is to deliver innovations 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.”

Additional information is available online at , and


Search press releases


Susanne Herzlieb
Maria-Theresien-Straße 23
97816 Lohr am Main
Phone: +49 9352 18-1573

Related Articles

Press Information

Intelligent hydraulics for increased availability

Connected hydraulics increase the availability of machinery and plants through condition monitoring and predictive maintenance. For this purpose, Rexroth offers scalable solutions, from individual units with local evaluation to the complete, cloud-based monitoring of large plants. Sensors measure all relevant operating conditions and software detects wear before it leads to failure. Retrofitting kits also economically integrate already installed plants into these concepts.

Press Information

Linear motion, short time to market

Stand-alone linear axes are the trend. The combination of electrical drive unit and mechanical or hydraulic cylinder reduces installation space and engineering time and combines our specific professional knowledge in one system. With ready-to-mount and i4.0-enabled solution packages, Bosch Rexroth is in line with the current market requirements regarding electrification, digitalization and monitoring as well as condition-based maintenance. The uniform control and drive concept which is used in the different technologies serves as a basis for a short time to market and the economical implementation of hybrid solutions.