Hydraulic pump proportional pilot solenoid valve 457-5747 for excavator Carter 313 320 323D2 336GC

Proportional valve and solenoid valve difference

     Proportional valves are divided into direct proportional valves and reverse proportional valves. Adjustable air pressure. The solenoid valve can only function as a switch. The solenoid valve is a valve that can only be powered on and off, and the proportional valve is a valve that can control the opening degree. To put it simply, the proportional valve is used to adjust the pressure. Speed. Ordinary solenoid valve reversing action

The working principle of the proportional valve

Proportional valve is a common component in the control system, its role is to control the flow, pressure and other parameters in the hydraulic system according to the proportion indicated by the input signal. Proportional valves work by adjusting the position of the spool to change the flow rate. When the voltage or current of the input signal changes, the proportional valve will automatically adjust the position of the spool, so that the output flow, pressure and other parameters are adjusted according to the set proportion. This control mode can achieve accurate hydraulic control, which is suitable for machining, aviation, aerospace, chemical industry and other fields. The design principle of proportional valve is based on electronic proportional technology, which mainly includes spool, drive cavity, controlled cavity, sensor and electric control board. Among them, the spool is the core component of the proportional valve, and its position determines the flow rate in the system. The driving cavity, the controlled cavity and the sensor are responsible for converting the input signal into mechanical motion. The electronic control board is the key to the proportional valve control, and the output flow is accurately controlled through the accurate electronic control method. In practical applications, proportional valves are often combined with servo valves, proportional pumps and other components to form a control system to realize the automation and intelligence of the hydraulic system. For example, in the machine tool control system, the proportional valve controls the position of the hydraulic drive cylinder to realize the positioning and processing of the workpiece. In metallurgical, chemical and other industries, proportional valves control the change of flow and pressure to ensure the stability and quality of the production process. It can be said that the proportional valve has become an indispensable part of the control system, promoting technological progress and innovation in various industries.