LSC – Linde Synchron Control

VT modular for more power and free configurability
Valve building block system for Load Sensing applications

The successful LSC Load Sensing technology is now extended by the third dimension. Besides the highly integrated monoblocks and manifold valve plates the LSC system now also offers a modular building block system with freely configurable valve sizes and functions. From a single valve with a flow of max. 600 l/min, up to maximum configuration for 12 actuators. This is unique in Load Sensing systems.

Since 25 years the Load Sensing technology "Linde Synchron Control" (LSC) has been approved as an ideal controlling principle for sophisticated hydraulic applications in open loops. The exact division and regulation of the oil flow according to the actual pressure and flow requirements is the basic principle of this system. When more power is demanded than the system is able to provide, the flow will remain divided in a defined quantity ration, making sure that all propel and work functions are executed, as demanded by the driver. There is no need for readjustments and tuning of individual components by the driver, the operator can fully concentrate on his work.

The valve technology for this flexible and convenient hydraulic control was previously available in two designs: in the form of a highly integrated monoblock, which is suitable for large quantities with identical functionalities, and as VT integrated system, in which a base plate with all central functions is fitted with subplate mounted directional control valves. This system is appropriate for machines with up to nine hydraulic actuators and a medium annual volume.

The third variant, the VT modular system, now is the latest development. Its manifold valve plates consist of individual components from a building block system and can therefore be optimally adapted to match the corresponding requirements, without having to develop and manufacture valve blocks specifically to match the application.

Flexible due to the building block system Exemplary VT modular manifold valve plate configuration for nine actuators.

The highest benefit of this system is its flexibility. The manifold valve plates can be exactly configured to match the application and will be available in the shortest possible time, in quantities of 1 or more.

The system is based on two different base plates - a smaller one for up to three functions, the bigger one for up to 12 functions. Both are available in purely hydraulic or electrically piloted version. Hydraulic versions can be subsequently electrified via a separate pilot valve bar.

The basic valve blocks are supplemented by infrastructure and function modules, individual directional control valves can also be sandwiched or mounted. Depending on the design, primary functions for the Load Sensing loop, like pressure relief, can be integrated or retrofitted as function modules. Mounted directional control valves to supply the main functions of the application are available in three different nominal sizes. VW18, VW25 and the new VW30. They can be mounted in any position on the basic valve block. Sandwich valves supply the ancillary functions. The valve characteristics can be influenced by intermediate plates and work port-mounted plates.

The new subplate mounted directional control valve VW30 supplies the main functions in the Load Sensing loop. Suitable for flows of up to 600 l/min.

The new VT modular system is suitable for Load Sensing loops with individual actuator flows of up to 600 l/min. With this Linde Hydraulics targets applications reaching far up into high power classes with a correspondingly high demand on individual actuators as well as the growing market for mobile special machines, which are mainly produced in lower quantities.

Until the present day manufacturers of such machines had to have a hydraulic valve block specially designed to be able to execute all required functions, or they had to choose a standard solution and cut back on power and functionalities. Now they can choose from a hydraulic control system, which offers individual functions, but due to the building block system can be easily configured and manufactured from approved series production components. In addition this system enables quick prototype solutions and shortens product development times of customers. The manufacturer profits from approved functionality and efficiency in combination with a considerably higher flexibility and an enhanced power spectrum.

From the view of the machine user LSC offers clear benefits, because the Load Sensing technology produces considerably lower power losses than open center systems. This results in a better fuel economy and high materials handling power. This is particularly noticeable on machines with complex work tasks and changing fields of operation. Here measurements confirm an advance in efficiency of around 10%, because the required pressure and oil flow are always on-demand and available just in time. This way the drive power is efficiently utilized and the system does not waste any energy. Another benefit arises from the intuitive, load independent operation, which is enabled by the Load Sensing system. This is why machines with LSC systems achieve high materials handling power and the machine owners save twice, firstly on fuel, and secondly in labour time.