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:

    What is a solenoid valve in a humidifier?

    A:

    The solenoid valve of a humidifier is found in the water supply line and is the component that controls the flow of water to the main body of the humidifier. "Solenoid" is a generic term for a device or component that uses energy to create linear motion.

    Full Answer >
    Filed Under:
  • Q:

    How does a battery work?

    A:

    According to the MIT School of Engineering, a battery provides an electrical charge due to the chemical reactions that take place inside it once it is connected into an electrical circuit. When a circuit connects the positive and negative poles, the anode and cathode inside the battery react with the electrolyte medium separating the two, producing a flow of electrons. This creates an electrical current and provides power.

    Full Answer >
    Filed Under:
  • Q:

    How do buzzers work?

    A:

    According to British Telephones, a magnetic effect is produced when a battery is connected to a buzzer's circuitry and the button is pressed. This causes electricity to flow through the coils, which attracts the armature and produces a sound. The current breaks at the device's contact screw, thereby collapsing the magnetic field until the buzzer's button is pressed.

    Full Answer >
    Filed Under:
  • Q:

    How does a transformer work?

    A:

    A transformer changes the voltage of an electric current while transferring it from one circuit to another through electromagnetic induction. Fluctuating magnetic fields in the transformer generate an electric current in a coil of wire, and the voltage they put out is directly proportional to the number of turns in the coil of wire.

    Full Answer >
    Filed Under:

Explore