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y on drives with electrical servomotors. The velocity feedback loop does not provide any advantage on hydraulic drives with low damping D H, but is advantageous if it is used together with acceleration

— with one exception — are radial piston units fitted with a stroke ring designed accordingly ( Figure M 8 ). [...] A group with the category of slow speed high torque motors which achieves its high torque by having each displacement unit perform several strokes (between four and eight or so) per revolution. These —

respective opening cross section for the proportional directional valve. The circuit with the constant pump is associated with higher energy losses since the flow rate which is not required flows away via the [...] pump will provide a standby pressure . A load sensing system with a variable pump will often be subordinate to some form of power limiter with pressure limitation . Structure of load sensing systems Variation [...] p LS is fed back to the inlet pressure compensator or the LS controller for the pump and compared with the system pressure p 1 . The system pressure p 1 is controlled via adjustments reflecting the lo

states that, e.g., with a 10-μm absolute filter no glass beads with a 10-μm diameter are allowed to pass through the filter. The expression should therefore only be used in conjunction with the glass bead

transducer with a supply voltage. This voltage is changed by the load on the sensor and supplied to the input stage on the amplifier. This signal is amplified there into a low noise output signal with minimised [...] minimised zero point drift. Alternative: measuring amplifier with carrier frequency

possible paths associated with a program execution sequence (DIN 44 300). The program flowchart makes it possible therefore to provide an overview of the control sequence for a system with all the signal and [...] and control functions and regardless of the technology associated with the devices. Graphical representation is defined in DIN 66 001.

lack of play at the teeth, internal gear pumps are associated with very low delivery flow pulsation and are therefore quiet during operation. With axial play compensation they can achieve average pressures [...] Pump with two gear wheels in most cases whose outer (ring gear) has teeth on the inside. The inner sprocket is smaller. The fluid is conveyed in the spaces between the gaps in the teeth of the two gear [...] pressures of up to around 160 bar, while 300 to 320 bar is possible with combined axial and radial play compensation at the sprocket and ring gear (Figure I 11) . Their geometric displacement cannot be adjusted

(b) . Electro-hydraulic control technology with continuously adjustable valves ( high response proportional valves , servo valves ). This technology operates with continuous sensors and electronic control [...] This term covers all combinations of electrical (electronic) signal processing with hydraulic drives. These combinations can be divided into three groups: Electro-hydraulic technology in which hydraulic [...] generally undertaken using relay technology (Figure E 22 a) . Electro-hydraulic control technology with continuously adjustable valves ( proportional valves ). This technology permits continuous adjustment

characteristic ). Example: presses. Feed motion : with the action of the force over the entire working stroke and a very consistent, load-independent motion with widely varying velocities. Example: feed on machine [...] during which the force is only required at the end of the travel with very high velocity during the movement. Example: injection moulding machine. On cylinders a differentiation is made between four different [...] different types of motion that affect the structure of the drive: Transport motion : with the highest force required on accelerating the load. The velocity can mostly not be maintained accurately. Example:

becoming deformed. Compact seals are often combined with guide elements to form piston seals . Compact seals for piston rods are often installed with a supporting ring ( back ring ) in order to improve [...] Design category for seals with a block-like body and a less pronounced sealing edge. A characteristic feature is how the preload is applied not only by the sealing lips , but also by the body of the seal [...] types of seals are elastomer/energised plastic faced seals. They consist of a sealing ring (generally with bronze or carbon-filled PTFE) which is subjected to a preload by an elastically deformed O-ring The