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Hydraulic system

Hydraulic system consists of signal control and hydraulic power of two parts, the signal control part is used to drive hydraulic power part of the control valve action.
Hydraulic power part of the circuit diagram that way to indicate the relationship between different functional components. Hydraulic source contains hydraulic pump, electric motor and auxiliary hydraulic components; Hydraulic control part contains a variety of control valves, used to control the working fluid flow, pressure and direction; Executive part contains a hydraulic cylinder or hydraulic motor, which can be selected according to actual requirements .
In the analysis and design of practical tasks, the general use of the block diagram shows the actual operation of the equipment. Hollow arrows indicate signal flow, while solid arrows indicate energy flow.
Sequence of actions in the basic hydraulic circuit - Commutation and spring return of the control element (two-position, four-way valve), extension and retraction of the actuator (double acting hydraulic cylinder) and opening and closing of the relief valve. For actuators and controls, presentations are based on the corresponding circuit diagram symbols, which are also prepared to introduce the circuit diagram symbols.
Depending on how the system works, you can number all loops sequentially. If the first actuator number is 0, the control element identifier associated with it is 1. If the component identifier corresponding to the actuator overhang is an even number, the component identifier corresponding to the actuator retraction is an odd number. The hydraulic circuit should be numbered not only, but also the actual equipment number to find the system fault.
The DIN ISO1219-2 standard defines the numbering of an element, which consists of the following four parts: the device number, the loop number, the element identifier and the element number. If the entire system has only one device, you can omit the device number.
In fact, another numbering method is to continuously number all the components in the hydraulic system. In this case, the component number should be consistent with that in the component list. This method is particularly suitable for complex hydraulic control systems, each of which corresponds to its system number>

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