Hydraulic Directional Valve Symbols

The symbol meaning of the hydraulic directional valve expresses that the structural form of the hydraulic directional valve is extremely several ways, the median function of the hydraulic directional valve, the on-off control function of the oil circuit when energized and not energized, etc., through the symbolic meaning on the nameplate of the hydraulic directional valve can be quickly judged the approximate model and function of the hydraulic directional valve. Elephant Fluid Power pays special attention to these details when manufacturing hydraulic directional valves, so let's take a look at the symbolic meaning of hydraulic directional valves.

The above figure is a commonly used hydraulic directional valve symbol, there are three boxes in the symbol, and the three boxes are separated by a solid line, indicating that this hydraulic electromagnetic directional valve has three working positions, and the middle box is marked with PTAB four oil holes, indicating that this is a four-way valve, and the box marked with letters indicates that this is the median position of the valve, that is, the initial working position when the valve is not energized.

Hydraulic solenoid directional valve models have different median functions, and each neutral function corresponds to a different symbol. Therefore, through the hydraulic solenoid directional valve symbol, the median function model of the valve and the on-off of the oil circuit can be intuitively understood.

The hydraulic solenoid directional valve symbol has lowercase letters A and B on the left and right sides, indicating that this valve has two solenoid controls on the left and right. For a four-way hydraulic solenoid directional valve, because there are only two working positions, only one end has an electromagnet and the other end is a return spring, the symbol is as follows:

It should be noted that although the hydraulic solenoid reversing valve symbol in the figure above also has three boxes, the valve is a two-position solenoid valve, the dotted line is used between the boxes instead of a solid line, and the box representing the dotted line in the middle is a transition function, that is, when the hydraulic solenoid reversing valve is energized, the valve core is instantly passed through in the process of moving from the left to the right function. Different transition machines can affect the starting smoothness of the hydraulic system in practice.

The picture above is another two-way four-way hydraulic directional valve symbol, compared to the three-way four-way of the first hydraulic directional valve, the middle box uses a dotted line, indicating that it is not the actual working position. There is no wavy line on the left and right A and B symbols of the symbol, which means that there are no springs installed on both sides of this reversing valve, which belongs to the springless return hydraulic reversing valve, which is less used in practice.

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