Overview of directional control valve
2024-07-24 09:02:52
Divided by the use of one-way valve and the valve. Check valve: Only allow the fluid in the pipeline unidirectional connected, the reverse that cut off. Directional valve: change the relationship between the different lines of ﹑ ﹑ off, according to the spool in the valve body working position divided into two digits, three, etc.; according to the number of channels divided into two links ﹑ tee ﹑ Stone Five links and so on; according to the spool drive sub-manual ﹑ ﹑ motorized ﹑ hydraulic and so on. Figure 2 for the three four-way valve working principle. P is the fuel supply port, O is the oil return port, A ﹑ B is the output port leading to the actuator. When the valve core is in the middle, all the oil ports are cut off and the actuator does not move; when the valve spool is moved to the right position, P and A pass, B and O pass; when the valve spool moves to the left, P and B Pass, A and O pass. In this way, the actuator can be positive and reverse motion. In the late 1960s, electro-hydraulic proportional control valves were developed on the basis of the above several hydraulic control valves. Its output (pressure, flow) can vary continuously with the incoming electrical signal. Electro-hydraulic proportional control valve according to different roles, correspondingly divided into electro-hydraulic proportional pressure control valve, electro-hydraulic proportional flow control valve and electro-hydraulic proportional directional control valve.
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