What are the explanations of the direction, pressure and flow control of the liquid valve?
1. Direction control
According to their uses, they are divided into one-way valves and reversing valves. One-way valve: only allows fluid to be connected in one direction in the pipeline, and will be blocked in the reverse direction. Directional valve: changes the on and off connections between different pipelines. According to the working position of the valve core in the valve body, it is divided into two-way, three-way, etc.; according to the number of controlled channels, it is divided into two-way, three-way, four-way, five-way, etc.; according to the valve core driving mode, it is divided into manual, motorized and electric. , Hydraulic, etc.
2. Pressure control
According to their uses, they are divided into relief valves, pressure reducing valves and sequence valves.
⑴ Relief valve: It can control the hydraulic system to maintain a stable state when it reaches the set pressure. The relief valve used for overload protection is called a safety valve. When a system failure occurs 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.
⑵ Pressure reducing valve: It can control the branch circuit to obtain a stable pressure lower than the main circuit oil pressure. Pressure reducing valves can be divided into fixed value pressure reducing valves (the output pressure is a stable value), fixed difference pressure reducing valves (the difference between input and output pressure is a fixed value) and fixed ratio pressure reducing valves according to the different pressure functions they control. (There is a certain ratio between input and output pressure).
⑶ Sequence valve: After one execution component (such as hydraulic cylinder, hydraulic motor, etc.) operates, other execution components can be activated in sequence. The pressure generated by the oil pump first pushes the movement of hydraulic cylinder 1, and at the same time, it acts on area A through the oil inlet of the sequence valve. When the movement of hydraulic cylinder 1 is complete, the pressure rises, and the upward thrust of area A is greater than the setting of the spring. After the value is reached, the valve core rises to connect the oil inlet and the oil outlet, causing the hydraulic cylinder 2 to move.
3. Traffic control
The flow rate is adjusted by adjusting the saver area between the valve core and the valve body and the local resistance it generates, thereby controlling the movement speed of the execution element. Flow control valves are divided into 5 types according to their uses
⑴ Throttle valve: After adjusting the throttle opening area, the movement speed of the actuating element with little change in load pressure and low requirements on motion uniformity can be basically kept stable.
⑵ Speed regulating valve: It can keep the inlet and outlet pressure difference of the saving valve at a constant value when the load pressure changes. In this way, after the throttle opening area is set, no matter how the load pressure changes, the speed regulating valve can maintain a stable flow rate through the throttle valve, thereby making the movement speed of the actuator components stable.
⑶ Diverter valve: Regardless of the size of the load, an equal-volume diverter valve or a synchronized valve can be used to obtain an equal flow rate between two actuators from the same oil source; a proportional diverter valve can be used to distribute the flow according to proportions.
⑷ Collecting valve: The effect is opposite to that of the diverter valve, so that the flow flowing into the collecting valve is distributed according to the share.
⑸ Diverter and collector valve: It has the functions of diverter valve and collector valve.