Full definition
A solenoid valve is an electromechanical device used to control the flow of liquids or gases in a pneumatic system. It consists of a solenoid, which is an electromagnetic coil that, when energized, creates a magnetic field that moves a plunger or armature. This movement either opens or closes the valve, allowing or blocking flow. Solenoid valves are widely used due to their quick response times, typically ranging from 20 ms to 80 ms, making them ideal for applications requiring rapid switching. Common voltages for solenoid valves include 12VDC, 24VDC, 110VAC, and 220VAC, allowing for flexibility in various industrial settings.
The construction of solenoid valves varies, but they often feature a robust design that adheres to protection classes such as IP65, ensuring resistance to dust and water. Higher protection ratings like IP67 or IP69K are also available for applications requiring additional environmental resistance. The standard IEC 60730 outlines the requirements for automatic electrical controls for household and similar use, which includes solenoid valves in its scope, ensuring safety and reliability in operation.
In practical applications, solenoid valves are integral to automation systems, controlling fluid flow in processes such as pneumatic conveyance, hydraulic systems, and HVAC setups. They can be designed for normally closed or normally open configurations, providing versatility in design and control. Brands such as Festo, SMC, Parker, Bosch Rexroth, Asco, and Bürkert are recognized leaders in the manufacturing of solenoid valves, offering a range of products tailored for various industrial needs.