Q:

How does a solenoid valve work?

A:

Quick Answer

Solenoid valves use electromagnets to move a plunger attached to the valve to open or close it. Cutting the power to the electromagnet allows a spring or other force to return the plunger to its original position. Automatic irrigation systems often use solenoid valves to control water delivery.

 Know More

Full Answer

The electromagnet is a coil of wire. Moving electricity establishes a magnetic field. In the valves used for automated sprinklers, water pressure from the line presses a diaphragm to keep the valve closed. When the electrical impulse moves the plunger, it opens a small hole that allows the water pressure to drain, and pressure from the opposite side moves the diaphragm up to open the main valve to the sprinklers. As long as the small port is open, water continues to flow to the system.

Removing power from the electromagnet closes the port, and the diaphragm fills with water again. Once the pressure behind the diaphragm reaches the critical point, the water pressure forces the valve to close again and the sprinklers stop spraying water.

In the normally closed solenoid valve, the valve remains closed unless the magnet receives power. For some applications, a normally open valve is a better fit. In these solenoid valves, applying power closes the valve.

Learn more about Electricity

Related Questions

  • Q:

    How do you check the idle air control valve?

    A:

    Idle air control valves can be tested for resistance, mechanical function and valve triggering with a digital multimeter. An idle air valve is important for maintaining correct idle engine speed.

    Full Answer >
    Filed Under:
  • Q:

    Why won't my Maytag top load washer fill with water?

    A:

    A Maytag top-load washer fails to fill with water for a variety of reasons, including closed water valves, kinked hoses and dirty valve screens, according to the manufacturer. All of these problems are easy to troubleshoot without professional help.

    Full Answer >
    Filed Under:
  • Q:

    How does a lightbulb work?

    A:

    An incandescent bulb works by using electricity to generate enough heat to make the bulb's filament glow and emit light, while a fluorescent lamp functions by colliding gaseous atoms with electrons and transforming the ultraviolet that is produced into visible light. An incandescent bulb produces more heat and radiates less light compared to a fluorescent lamp.

    Full Answer >
    Filed Under:
  • Q:

    How does a capacitor work?

    A:

    Capacitors work by accumulating charge at the surface of two electrical conductors separated by an insulator in the presence of an electric potential. The positive capacitor plate accumulates positive charges, while the negative plate accumulates negative charges

    Full Answer >
    Filed Under:

Explore