Detailed classification of the hottest hydraulic v

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Detailed classification and introduction of hydraulic valves

are used to control hydraulic pressure in hydraulic transmission? Flow and direction elements. Among them, the control system software that controls the pressure is the operating system platform, which is called the pressure control valve, and the control software that controls the flow is called the flow closed oil return valve control valve, which controls the flow? Those that cut off and flow are called directional control valves. Pressure control valves can be divided into overflow valves according to their applications? Pressure reducing valve and sequence valve. (1) Overflow valve: it can control the hydraulic system to maintain a constant state when reaching the set pressure. The overflow valve used for overload protection is called a safety valve. When the system fails and the pressure rises to the limit value that may cause damage, the valve port will open and overflow to ensure the safety of the system. (2) Pressure reducing valve: it can control the branch circuit to obtain a stable pressure lower than the oil pressure of the main circuit. According to the different pressure functions it controls, the pressure reducing valve can be divided into fixed value pressure reducing valve (the output pressure is a constant value)? Differential pressure reducing valve (the difference between input and output pressure is a fixed value) and proportional pressure reducing valve (a certain proportion is maintained between input and output pressure). (3) Sequence valve: it can make one actuator (such as hydraulic cylinder, hydraulic motor, etc.) act, and then make other actuators act in sequence. The pressure generated by the oil pump first pushes the hydraulic cylinder 1 to move, and at the same time, it acts on the area a through the oil inlet of the sequence valve. When the hydraulic cylinder 1 moves completely, the pressure rises, and the upward thrust acting on the area a is greater than the set value of the spring, and the valve core rises to connect the oil inlet with the oil outlet, so that the hydraulic cylinder 2 moves. The flow control valve uses the orifice area between the regulating valve core and the valve body and the local resistance it produces to regulate the flow, so as to control the movement speed of the actuator. The flow control valve is divided into 5 types according to the purpose. (1) Throttle valve: after adjusting the throttle area, the movement speed of the actuator with little change in load pressure and low requirements for motion uniformity can basically remain stable. (2) Speed regulating valve: when the load pressure changes, the differential pressure between the inlet and outlet of the throttle valve can be maintained as a fixed value. In this way, after the throttle area is set, no matter how the load pressure changes, the speed regulating valve can maintain the same flow through the throttle valve, so as to stabilize the movement speed of the actuator. (3) Diverter valve: equal flow diverter valve or synchronous valve can make two actuating elements of the same oil source obtain equal flow regardless of the load; The proportional diverter valve is obtained by distributing the flow in proportion. (4) Collecting valve: the function is opposite to the diverter valve, so that the flow into the collecting valve has higher processing efficiency to meet the future demand. The flow of the flow valve is distributed in proportion. (5) Diverter and collector valve: it has two functions: diverter valve and collector valve. The directional control valve is divided into one-way valve and directional valve according to its purpose. One way valve: only the fluid is allowed to connect in one direction in the pipeline, and the reverse direction is to cut off. Reversing valve: change the connection between different pipelines? Break the relationship? According to the working position of the valve element in the valve body, it can be divided into two positions? Three equal; According to the number of controlled channels, there are two connections? tee? Cross? Five connections, etc; According to the drive mode of the valve core, it can be separated? maneuver? Electric? Hydraulic, etc. Figure 2 shows the working principle of the three position four-way directional valve. P is the oil supply port, O is the oil return port, a? B is the explosive big data output port leading to the actuator. When the valve element is in the middle position, all oil ports are cut off and the actuator does not move; When the valve element is moved to the right position, P and a are connected, and B and o are connected; When the valve element is moved to the left position, P and B are connected, and a and o are connected. In this way, the actuator can be aligned? Reverse motion

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