More machine classes: Rexroth LUDV valve platform RS LARGE now suitable for wider application

• Configurable valve sections now for more machine classes
• Greater energy efficiency thanks to (dual-circuit) flow sharing technology
• Online configurator reduces time for engineering and prototype construction

Bosch Rexroth is expanding the adaptable and scalable valve platform RS LARGE with new modules for larger machine classes. The new flow sharing modules, which start at frame size 22, are optimized for electro-hydraulic control and are fully prepared for driver assistance functions. Manufacturers of large construction machinery, material handling equipment or forestry vehicles benefit from a flexible machine design with standardization effects as well as greater energy efficiency and simple digitalization. The valve platform is also suitable for mobile cranes, large lift trucks, bulldozers and industrial excavators for recycling and similar applications.

The RS LARGE valve sections of sizes 15, 20 and 22 enable highly flexible assembly of hydraulic control blocks for off-highway vehicles from individual modules. Moreover, with consumer flow rates of up to 400 l/min, the modular control blocks are optimized with regard to their space requirement, weight, performance and energy efficiency. The valve sections in size 22 are new to the RS portfolio, while additional modules in size 25 and higher are also in preparation.

Maximum agility with online configurator

With the RS LARGE online configurator, machine manufacturers can quickly and easily create their very own valve configurations. The corresponding circuit diagrams as well as the 2D and 3D installation models are generated automatically and made available for download. This delivers significant time savings in engineering since users can check the positioning of the control block in the machine at an early stage and make any necessary adjustments. Upon order submission, all technical documents are transferred directly to Bosch Rexroth production planning. This ensures shorter delivery times, particularly for the construction of prototypes or small series.

Increased flexibility

With its modular approach, the Rexroth flow sharing platform (RS) provides off-highway manufacturers with a flexible and efficient means of creating customer-specific machine concepts in a single or dual-circuit system. By combining post- and pre-compensated valve sections, such customer-specific concepts exploit the full benefits of the flow sharing approach and benefit from its ability to distribute flow in a pump saturation state across all consumers when under peak load. This avoids an abrupt and potentially dangerous breakdown in the motion of a function in the case of flow saturation. At the same time, the platform allows specific functions to be prioritized – for example, a slew drive or an attachment. Additional function modules can be integrated to minimize assembly and piping requirements as well as to reduce the overall complexity. Examples include the RSM20 stabilizing module for wheeled loaders, an anti-drift valve (ADV) or the RBM15 steering priority module.

Greater energy efficiency thanks to (dual-circuit) flow sharing

The RS valve platform strikes an ideal compromise between reduced pressure loss, accurate control and a modular hydraulic architecture, thereby creating optimum conditions for maximizing the overall efficiency of mobile working machines. The dual-circuit element enables intelligent connection or disconnection of the two hydraulic circuits, which boosts energy efficiency by at least ten percent. Regeneration functions for further efficiency gains can be integrated directly into the valve sections, while the tank preload can be adapted electro-hydraulically to the actual operating conditions.

Prepared for driver assistance functions

The electro-hydraulic control of the platform via software unlocks further potential for reducing energy use and raising efficiency. In combination with the modules of the electronic Open Circuit (eOC) solution portfolio, driving and working functions, for example, can be included in a shared hydraulic circuit. This also facilitates the integration of driver assistance functions, such as following specific trajectories or stopping vehicle movement upon departure of the working area. To this end, Bosch Rexroth offers a range of prepared software modules, which can be easily adapted to individual requirements.

Robust design for high-pressure applications

All RS valve sections are designed for consumer pressures of up to 420 bar and can be equipped with pressure relief valves with manual or electric-proportional adjustment. The pump port in the inlet element supports pressures of up to 400 bar as well as primary pressure relief. Additionally, the inlet features LS unloading along with an optional unloading valve to prevent pressure peaks and ensure that movements start dynamically.