Generally speaking, the entire hydraulic system is very simple. Below will briefly introduce the oil circuit layout and working principle of the hydraulic system.
The hydraulic pump is driven by a motor to complete oil suction and supply the hydraulic system with the required working conditions. The hydraulic pump here is the power component of the hydraulic system, which supplies pressure oil to the entire system.
The pressure oil at the outlet of the hydraulic pump directly reaches the inlet of the control valve through the oil pipe. Of course, there is usually a filter screen on the oil tank (which filters out impurities on both sides). The control valve is usually a multi way directional valve, and only the multi way directional valve can meet the movement of multiple actuators in the system. You're talking about an electromagnetic directional valve. The principle of an electromagnetic directional valve is the same as that of a manual directional valve, but the control method is different. The direction of the electromagnetic directional valve relies on an electromagnet. As you said, if the electromagnetic directional valve has ABPT 4 ports, that is, 4 ports. If the electromagnetic directional valve has two positions, that is, two directional positions, for example, the first directional position is the extension of the hydraulic cylinder, and the second directional position is the retraction of the hydraulic cylinder. So this electromagnetic directional valve is a two position four-way electromagnetic directional valve.
Hydraulic oil enters through the P port of the electromagnetic directional valve, and the directional control of the electromagnetic directional valve is achieved by energizing the electromagnetic iron. If it is switched to the first position, that is, P through A, and if the hydraulic cylinder wants to move, B must be connected to T in order to form a passage. To control the extension of the hydraulic cylinder. If we switch to the second reversing position, only the communication between each oil port is changed, and the principle is the same. P is connected to B, A is connected to T. To control the retraction of the hydraulic cylinder.
If there is PTAB on the oil circuit block, then your actuator must be connected to the oil circuit block. The electromagnetic directional valve has four oil ports ABPT, which must be connected to the ABPT on the oil circuit block in order to reach the rod chamber and rodless chamber of the hydraulic cylinder through the oil outlet pipe on the oil circuit block.
The small AB you mentioned must be connected to the AB of the electromagnetic directional valve, and then threaded to a larger oil pipe, and then connected to the hydraulic cylinder. There must be a PT port on the oil circuit block because the oil port of the electromagnetic directional valve is relatively small, and the electromagnetic directional valve needs to be fixed on the oil circuit block because the thread of the pump outlet connection will be relatively large. If it is small, the flow rate will not be enough, so it is connected to the electromagnetic directional valve by reducing the thread.
flow chart:
Pump outlet oil - oil circuit block inlet P1- electromagnetic directional valve inlet P - directional A or B - hydraulic cylinder with or without rod chamber - return oil with or without rod chamber - A or B - electromagnetic directional valve T port - T-oil tank on the oil circuit block.
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