The hydraulic valve is an important control element in the hydraulic system. According to the function of the hydraulic valve, it can be divided into flow valves, such as: throttle valve, speed control valve, diverting and collecting valve; pressure valve, such as: overflow valve, pressure reducing valve, Sequence valve, unloading valve; directional valve, such as electromagnetic reversing valve, manual reversing valve, one-way valve, hydraulic control one-way valve. Today we will only talk about the directional control valve.
Hydraulic reversing valve
The directional control valve is the reversing valve, which prevents and guides the flow of oil in and out of the passage in the hydraulic system, that is, controls the direction of oil flow in the oil circuit. There are two important concepts in the reversing valve, namely position and communication. Position means that the spool of the reversing valve has several working positions, which are indicated by squares in the diagram; through means there are several oil inlets and outlets, and arrows indicate the oil inlet and outlets in the diagram.
How to identify the position and connection in the hydraulic directional valve
So how to identify how many positions the hydraulic valve is? Two-position (left position, right position) and three-position (left position, right position, middle position) are more common in hydraulic directional valves, and the flow direction of the oil is different in each working position; the number of channels actually means changing Several oil pipes are connected to the valve, the common ones are two-way, three-way, four-way and five-way. There are a few squares on behalf of several valves, and a few oil ports on behalf of several ports, which together are called several ports. Such as two-position two-way valve, three-position four-way valve. In the simplified diagram, we can see that there are several "squares" separated by vertical lines in the symbol, and several are just a few digits. Look at a certain grid, there are several vertical lines that intersect with the border of the "square", and a few of them are just a few passes. The arrow indicates the passage (direction of liquid flow), one arrow indicates the two-way, that is, the oil inlet and outlet, and the two arrows are the four-way; the intersection of ┴ and ┬ and the box indicates that the passage is blocked by the valve core. If there are two arrows in a box in the figure, and a ┬, it means that the five links are blocked.