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 different lines through the broken relationship? According to the number of spool in the valve body working position divided into two digits? Three, etc.; According to the number of channels divided into two links? Three links? Stone? Five links, etc .; according to the spool drive sub-manual? Mobile? Electro-hydraulic and so on. Figure 2 for the three four-way valve working principle. P for the fuel supply port, O for the oil return port, A? B is the output 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 make positive and reverse movement. 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 be continuously changed with the input 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. More Keyword Search: Control Valve
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