The solenoid valve operates on the principle of

The solenoid valve operates on the principle of

• A. Electromagnetism
• B. Pneumatic pressure
• C. Thermal expansion
• D. Hydraulic pressure

Answer: (A)

Electrical energy creates a magnetic field that moves a valve component. When current flows through the coil, it becomes magnetized and pulls the plunger (armature) toward the coil’s core. This motion shifts the internal passageways to open or close the flow, controlling air or fluid in the system. A return mechanism, such as a spring, pushes the plunger back when power is removed, restoring the valve to its default position. Some designs are normally closed and open when energized, while others are normally open and close when energized. Pneumatic pressure, thermal expansion, or hydraulic pressure describe other ways fluids or materials can move, but they are not how a solenoid valve operates—the magnetic action of the energized coil is the fundamental mechanism here.

Electrical energy creates a magnetic field that moves a valve component. When current flows through the coil, it becomes magnetized and pulls the plunger (armature) toward the coil’s core. This motion shifts the internal passageways to open or close the flow, controlling air or fluid in the system. A return mechanism, such as a spring, pushes the plunger back when power is removed, restoring the valve to its default position. Some designs are normally closed and open when energized, while others are normally open and close when energized.

Pneumatic pressure, thermal expansion, or hydraulic pressure describe other ways fluids or materials can move, but they are not how a solenoid valve operates—the magnetic action of the energized coil is the fundamental mechanism here.