How to Use Electric Water Solenoid Valve 12V DC Normally Closed 1/4": Examples, Pinouts, and Specs

The Electric Water Solenoid Valve 12V DC Normally Closed 1/4" is an electrically operated valve designed to control the flow of water in a system. This valve is "normally closed," meaning it remains in a closed state, preventing water flow until a 12V DC electric current is applied. It is widely used in applications requiring precise water flow control, such as irrigation systems, plumbing setups, and automation projects.

• Irrigation Systems: Automating water flow for gardens, farms, or greenhouses.
• Plumbing: Controlling water supply in residential or industrial systems.
• Automation: Integrating into smart home systems or industrial automation setups.
• Liquid Dispensing: Used in vending machines or beverage dispensers.

Below are the key technical details and pin configuration for the Electric Water Solenoid Valve:

The solenoid valve has two wires for electrical connection. These wires are not polarized, meaning you can connect them in either orientation.

1. Power Supply: Connect the solenoid valve to a 12V DC power source. Ensure the power supply can provide at least 300 mA of current.
2. Control Mechanism: Use a switch, relay, or transistor to control the flow of current to the valve. This allows you to open or close the valve as needed.
3. Plumbing Connection: Attach the valve to a 1/4-inch water pipe. Ensure the connections are watertight to prevent leaks.
4. Testing: Apply 12V DC to the valve. The valve should open, allowing water to flow. Disconnect the power to close the valve.

• Power Supply: Use a stable 12V DC power source to avoid damaging the valve.
• Water Quality: Ensure the water is clean and free of debris to prevent clogging.
• Orientation: Install the valve in the correct orientation as indicated by the flow direction arrow on the body.
• Heat Dissipation: Avoid prolonged activation of the valve to prevent overheating of the coil.
• Safety: Always turn off the power supply before making electrical or plumbing connections.

The solenoid valve can be controlled using an Arduino UNO and a relay module. Below is an example circuit and code:

1. Connect the solenoid valve to the relay module's Normally Open (NO) terminal and Common (COM) terminal.
2. Connect the relay module's VCC, GND, and IN pins to the Arduino's 5V, GND, and a digital pin (e.g., D7), respectively.
3. Power the solenoid valve with a 12V DC power supply.

// Define the pin connected to the relay module
const int relayPin = 7;

void setup() {
  // Set the relay pin as an output
  pinMode(relayPin, OUTPUT);
  // Ensure the relay is off initially
  digitalWrite(relayPin, LOW);
}

void loop() {
  // Turn the solenoid valve ON (open)
  digitalWrite(relayPin, HIGH);
  delay(5000); // Keep the valve open for 5 seconds

  // Turn the solenoid valve OFF (close)
  digitalWrite(relayPin, LOW);
  delay(5000); // Keep the valve closed for 5 seconds
}

Note: Use a flyback diode across the relay coil to protect the circuit from voltage spikes.

1. Can this valve be used with liquids other than water?

   • This valve is designed for water and non-corrosive liquids. Avoid using it with corrosive or high-viscosity fluids.

2. Is the valve waterproof?

   • The valve is water-resistant but not fully waterproof. Avoid submerging it in water.

3. Can I control the valve with a microcontroller directly?

   • No, the valve requires more current than a microcontroller can provide. Use a relay or transistor to control it.

4. What happens if I reverse the polarity of the wires?

   • The valve is not polarity-sensitive, so reversing the wires will not cause any issues.

By following this documentation, you can effectively integrate the Electric Water Solenoid Valve 12V DC Normally Closed 1/4" into your projects for reliable water flow control.