(1) Control block Control block Proportional direction valve to the LUDV principle (Load pressure - Independent - Flow - Distribution) (2) Actuator control Actuator control At the spool (2) the direction and volume of flow is determined that flows to the actuator connections (A or B). The spring chambers (8) are supplied with pilot pressure either via the pilot connections a and b hydraulic control. The value of the pilot pressure within the spring chamber (8) determines the stroke of the spool (2). The pressure compensator (3) controls the pressure differential at the spool (2) and therefore, the flow to the actuators (A, B).
( 3) 3) Loader pressure compensation (LUDV) Loader pressure compensation (LUDV) The control block works to the LUDV principle. In this load - sensing version the pressure compensators (3) are located between the spool (2) and the actuator connections (A, B). The highest load pressure of all of the actuators involved is applied to all of the pressure compensators. In parallel it is also applied to the pump. If the pump flow is insufficient for all of the functions, then all work movements are reduced in speed by the same ratio. (4) Loading holding Loading holding Within each function axis a load holding valve (4) is fitted between the pressure compensator (3) and the actuator connections.
(5) Pressure safety, actuator connections Pressure safety, actuator connections Large nominal size port relief valve (7) with combined anti-cavitation functions protect the actuators from overloads and cavitation. (6) Float position Float position The float position is obtained by means of a 4-position spool. (7 (7) Regeneration Regeneration To prevent cavitation, with negative loads (e. g. dump or lowering), the tank port is pre-loaded via counter balance valve (5) and is fed with oil via the regeneration check valve (6) downstream of the pressure compensator. 6-27