One of the primary applications of solenoid plungers is in the field of valves. Solenoid valves control the flow of fluids or gases by using the movement of the plunger to open or close the valve. By controlling the electric current flow through the solenoid coil, the position of the plunger can be precisely controlled, allowing for accurate regulation of the fluid or gas flow. This makes solenoid valves a crucial component in many industrial processes such as liquid dispensing systems, irrigation systems, and HVAC control.