Hydraulic system It consists of signal control and hydraulic power. The signal control part is used to drive the control valve in the hydraulic power part.

The hydraulic power part is represented by circuit diagram to show the relationship between different functional components. The hydraulic source comprises a hydraulic pump, a motor and hydraulic auxiliary components; The hydraulic control part contains various control valves, which are used to control the flow, pressure and direction of the working oil; The executive part contains Hydraulic cylinder or Hydraulic motor , which can be selected according to actual requirements.

When analyzing and designing actual tasks, block diagrams are generally used to display the actual operation status of equipment. A hollow arrow represents the signal flow, while a solid arrow represents the energy flow.

Action sequence in basic hydraulic circuit - reversing and spring return of control elements (two position four-way reversing valve), extension and retraction of actuating elements (double acting hydraulic cylinder) and opening and closing of overflow valve. For the actuator and control components, the presentation is based on the corresponding circuit diagram symbols, which also prepares for the introduction of circuit diagram symbols.

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According to the working principle of the system, you can number all circuits in turn. If the actuator number is 0, the control element identifier associated with it is 1. If the element identifier corresponding to the extension of the actuator is even, the element identifier corresponding to the retraction of the actuator is odd. Not only the hydraulic circuit but also the actual equipment shall be numbered in order to find system faults.

DIN ISO1219-2 standard defines the numbering composition of components, which includes the following four parts: equipment number, circuit number, component identifier and component number. If there is only one equipment in the whole system, the equipment number can be omitted.

In fact, another numbering method is to serial number all components in the hydraulic system. At this time, the component number should be consistent with the number in the component list. This method is particularly suitable for complex hydraulic control systems, where each control loop corresponds to its system number.

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