What is the difference between a proportional valve and a solenoid valve? What are their functions?

What is the difference between a proportional valve and a solenoid valve? What are their functions? Proportional valve is a new type of hydraulic control device. In ordinary pressure valves, flow valves and directional valves, proportional electromagnets are used to replace the original control parts, and the pressure, flow or direction of the oil flow can be continuously and proportionally controlled remotely according to the input electrical signal. Proportional valves generally have pressure compensation performance, and the output pressure and flow rate are not affected by load changes. With the development of hydraulic transmission and hydraulic servo systems, some hydraulic systems have appeared in production practice that require continuous control of pressure, flow and direction, but do not require high control precision. Since ordinary hydraulic components cannot meet certain servo requirements, and the use of electro-hydraulic servo valves is too wasteful due to low control accuracy requirements, in recent years there have been products between ordinary hydraulic components (switch control) and servo valves ( proportional control valve between continuous control). The electro-hydraulic proportional control valve (proportional valve for short) is essentially a cheap electro-hydraulic control valve with good anti-pollution performance. The development of proportional valves has gone through two paths. One is to use proportional electromagnets to replace the manual adjustment input mechanism of traditional hydraulic valves. On the basis of traditional hydraulic valves: various proportional direction, pressure and flow valves have been developed;the other is some original Electro-hydraulic servo valve manufacturers developed on the basis of electro-hydraulic servo valves and reduced the design and manufacturing accuracy. Electromagnetic valve is an industrial equipment controlled by electromagnetism. It is a basic component of automation used to control fluids. It is an actuator and is not limited to hydraulic and pneumatic. Used in industrial control systems to adjust the direction, flow, speed and other parameters of the medium. Solenoid valves can cooperate with different circuits to achieve expected control, and the control accuracy and flexibility can be guaranteed. There are many types of solenoid valves. Different solenoid valves play a role in different positions of the control system. The most commonly used ones are one-way valves, safety valves, directional control valves, speed regulating valves, etc. There is a closed cavity in the solenoid valve, with through holes at different positions. Each hole is connected to a different oil pipe. There is a piston in the middle of the cavity, and two electromagnets on both sides. The valve body will be attracted to whichever side of the magnet coil is energized. On the other hand, by controlling the movement of the valve body to open or close different oil drain holes, and the oil inlet hole is normally open, the hydraulic oil will enter the different oil drain pipes, and then push the piston of the oil cylinder through the oil pressure, and the piston will It drives the piston rod, and the piston rod drives the mechanical device. In this way, the mechanical movement is controlled by controlling the current on and off of the electromagnet. The difference between proportional valve and solenoid valve Proportional valve is a new type of hydraulic control device. In ordinary pressure valves, flow valves and directional valves, proportional electromagnets are used to replace the original control parts, and the pressure, flow or direction of the oil flow can be continuously and proportionally controlled remotely according to the input electrical signal. Proportional valves generally have pressure compensation performance, and the output pressure and flow rate are not affected by load changes. 1. Ordinary valves cannot perform continuous step control in proportion. They are pure single-action switching valves. The valve opening direction, opening amount or spring setting force are all fixed and cannot be changed according to actual conditions. 2. The proportional valve performs continuous step control in proportion, and performs automatic compensation control on the target based on the information collected from changes in actual conditions. The valve opening direction, opening amount or spring setting force are all follow-up, achieving a series of continuous Controllable and changing movements. The flow control of the valve can be divided into two types: one is switch control: either fully open or fully closed, the flow is either large or small, and there is no intermediate state, such as ordinary electromagnetic straight-way valves, electromagnetic reversing valves, electro-hydraulic valves, etc. Directional valve. The other is continuous control: the valve port can be opened to any opening as needed, thereby controlling the flow rate. This type of valve is manually controlled, such as a throttle valve, or electronically controlled, such as a proportional valve and a servo valve. . The above is the difference between proportional valve and solenoid valve. What are the functions of each? Content introduction, if you want to know more relevant information, please log in to www.diancifa.cc to view the Dianwei Pneumatic.