Classification of hydraulic valves

Hydraulic valve is an automatic component operated by pressure oil. It is controlled by pressure oil of pressure distribution valve. It is usually used in combination with electromagnetic pressure distribution valve and can be used to remotely control the on-off of oil, gas and water pipeline systems in hydropower stations. Let's take a look at Dalan Hydraulic Motor to test how much you know about the function and classification of hydraulic valves? The function of hydraulic valve: It is used to reduce and stabilize the oil pressure of a branch in the system, and is often used in oil circuits such as clamping, control, and lubrication. There are direct type, pilot type and superposition type. Classification by control method: manual, electronic control, hydraulic control. Classified by function: flow valve (throttle valve, speed regulating valve, diverting and collecting valve), pressure valve (overflow valve, pressure reducing valve, sequence valve, unloading valve), directional valve (electromagnetic reversing valve, manual change valve, check valve, hydraulic control check valve). According to the installation method: plate valve, pipe valve, stack valve, threaded cartridge valve, cover valve. According to the operation mode: manual valve, motorized valve, electric valve, hydraulic valve, electro-hydraulic valve, etc. 1. Direction control is divided into one-way valve and reversing valve according to the purpose. One-way valve: Only allow the fluid to be connected in one direction in the pipeline, and the reverse is cut off. Reversing valve: Change the on and off relationship between different pipelines. ①According to the number of working positions of the spool in the valve body, it can be divided into two positions, three positions, etc.; ②According to the number of controlled channels, it can be divided into two-way, three-way, four-way, five-way, etc.; ③According to the driving method of the spool, it can be divided into manual, Motorized, electric, hydraulic, etc. 2. The pressure control is divided into relief valve, pressure reducing valve and sequence valve according to the purpose. ①Relief valve: It can control the hydraulic system to maintain a constant state when it reaches the set pressure. The relief valve used for overload protection is called a safety valve. When the system fails and the pressure rises to a 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 main circuit oil pressure. According to the different pressure functions it controls, the pressure reducing valve can be divided into a fixed value pressure reducing valve (the output pressure is a constant value), a fixed difference pressure reducing valve (the difference between the input and output pressure is a fixed value) and a fixed ratio pressure reducing valve. (Maintain a certain ratio between input and output pressure). ③Sequence valve: After making one actuator (such as hydraulic cylinder, hydraulic motor, etc.) act, 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 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 setting of the spring. After the value is reached, the spool rises so that the oil inlet and the oil outlet are connected, so that the hydraulic cylinder 2 moves. 3. The flow control uses the throttle area between the regulating valve core and the valve body and the local resistance generated by it to adjust the flow, thereby controlling 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 area of ​​the orifice, the movement speed of the actuator with little change in load pressure and low requirement for uniformity of movement can be basically kept stable. ②Speed ​​control valve: When the load pressure changes, the pressure difference between the inlet and outlet of the throttle valve can be kept as a constant value. In this way, after the orifice area is adjusted, no matter how the load pressure changes, the speed regulating valve can keep the flow rate through the throttle valve unchanged, so that the movement speed of the actuator is stable. ③ Diverter valve: Regardless of the size of the load, the one that can enable the two actuators of the same oil source to obtain the same flow is an equal-amount diverter valve or a synchronous valve; the one that obtains the proportional flow is a proportional diverter valve. ④ Collector valve: The function is opposite to that of the diverter valve, so that the flow into the collector valve is proportionally distributed. ⑤ Diverting and collecting valve: It has two functions of diverting valve and collecting valve.
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