Solenoid valve is a control element widely used in the field of industrial automation, which uses electromagnetic force to control the on/off of fluid, and has the advantages of fast response, precise control, energy saving and environmental protection. There are many types of solenoid valves, which can be divided into many types according to different classification standards. The following Haisen hardware will give you a detailed introduction to the types of solenoid valves.
1. Classification according to the working principle
1.Direct-acting solenoid valve: Direct-acting solenoid valve is the most basic kind of solenoid valve, and its working principle is to use the magnetic force generated by the coil to directly push the movement of the valve core, so as to control the on-off of the fluid. The direct-acting solenoid valve has a simple structure and fast response, but the working pressure range is narrow, and it is generally suitable for low-pressure and low-flow occasions.
2.Pilot solenoid valve: The pilot solenoid valve is composed of a pilot valve and a main valve, the pilot valve opens or closes first, and the opening or closing of the main valve is controlled by the pressure difference between the two ends of the main valve core. The pilot-operated solenoid valve has a large working pressure range and flow regulation ability, and is suitable for high-pressure and high-flow occasions.
3.Step-by-step direct-acting solenoid valve: Step-by-step direct-acting solenoid valve combines the characteristics of direct-acting and pilot-operated solenoid valves, when the coil is energized, the pilot valve acts first, so that the pressure at both ends of the main spool is balanced, and then the main spool acts. This solenoid valve is suitable for occasions with large pressure difference and a wide range of working pressures.
3.Diaphragm solenoid valve: Diaphragm solenoid valve uses the elastic deformation of the diaphragm to control the on/off of the fluid. When the coil is energized, the diaphragm is bent upwards by magnetic force to open the valve; When the power is lost, the diaphragm returns to its original state and the valve is closed. Diaphragm solenoid valve has the advantages of simple structure, fast response speed and good sealing, and is widely used in the control of liquid, gas and other media.
2. Classification according to the structure of the valve body
Solenoid valves can be divided into various types such as globe valves, safety valves, reversing valves, and pressure reducing valves.
1. The globe valve is a commonly used solenoid valve, and its spool is plug-shaped, which controls the switch of the fluid channel through the lifting of the spool.
2. The safety valve is a solenoid valve used to protect equipment and systems, and when the fluid pressure exceeds the set value, the safety valve will automatically close to prevent damage to the equipment and system.
3. The reversing valve is a solenoid valve that can change the direction of fluid flow, which is widely used in occasions that need to change the direction of fluid.
4. The pressure reducing valve is a solenoid valve used to reduce the fluid pressure, which adjusts the fluid pressure by controlling the displacement of the valve core to meet different process requirements.
3. Classification according to the field of application
1.Liquid solenoid valve: Liquid solenoid valve is mainly used to control the on/off of liquid medium, such as water, oil, acid, alkali, etc. Liquid solenoid valves have the characteristics of good sealing, corrosion resistance, high pressure resistance, etc., and are widely used in water treatment, petrochemical, food processing and other industries.
2.Gas solenoid valve: Gas solenoid valve is mainly used to control the on/off of gas medium, such as air, nitrogen, oxygen, etc. Gas solenoid valves have the advantages of fast response, precise control, explosion-proof, etc., and are widely used in industrial automation, aerospace, gas equipment and other fields.
3.Steam solenoid valve: The steam solenoid valve is used to control the on-off of steam medium, and has the characteristics of high temperature resistance, high pressure resistance, and corrosion resistance. Steam solenoid valves are widely used in heating, printing and dyeing, pharmaceutical and other industries.
To sum up, there are many types of solenoid valves, and each solenoid valve has its own unique working principle, structural characteristics and application fields. In practical applications, we need to select the right solenoid valve type according to the specific control requirements, operating conditions and media characteristics. At the same time, we also need to pay attention to the quality, reliability, life and other performance indicators of the solenoid valve to ensure its stability and reliability in actual operation.