How to Use 24 V DC Solenoid Valve NC: Examples, Pinouts, and Specs

The 24 V DC Solenoid Valve NC (Normally Closed) is an electromechanical device designed to control the flow of fluids. When energized with a 24-volt DC power supply, the valve opens to allow fluid flow. Conversely, when de-energized, the valve closes to stop the flow. This type of solenoid valve is commonly used in various applications, including:

• Automated irrigation systems
• Industrial fluid control
• HVAC systems
• Water treatment plants
• Automotive applications

1. Power Supply: Connect the positive terminal of a 24 V DC power supply to Pin 1 and the negative terminal to Pin 2.
2. Control: Use a switch or a microcontroller (e.g., Arduino UNO) to control the power supply to the solenoid valve.
3. Fluid Connections: Connect the inlet and outlet ports to the fluid lines. Ensure that the flow direction matches the arrow on the valve body.

• Polarity: Ensure correct polarity when connecting the power supply to avoid damage.
• Voltage: Use a regulated 24 V DC power supply to ensure stable operation.
• Environment: Install the valve in a location that is protected from extreme temperatures and moisture.
• Maintenance: Periodically check for debris or blockages in the valve to ensure proper operation.

/*
 * Example code to control a 24 V DC Solenoid Valve NC using Arduino UNO.
 * The solenoid valve is connected to a relay module, which is controlled
 * by the Arduino.
 */

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

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

void loop() {
  digitalWrite(relayPin, HIGH); // Turn on the relay (energize solenoid)
  delay(5000); // Keep the valve open for 5 seconds
  digitalWrite(relayPin, LOW); // Turn off the relay (de-energize solenoid)
  delay(5000); // Keep the valve closed for 5 seconds
}

1. Valve Not Opening/Closing:
   • Solution: Check the power supply voltage and ensure it is 24 V DC. Verify the connections and polarity.
2. Fluid Leakage:
   • Solution: Ensure that the fluid connections are tight and that the seals are intact. Check for any debris in the valve.
3. No Response from Valve:
   • Solution: Verify that the control signal (e.g., from Arduino) is correctly reaching the relay module. Check the relay module for proper operation.

• Check Connections: Ensure all electrical and fluid connections are secure and correct.
• Measure Voltage: Use a multimeter to measure the voltage at the solenoid terminals to ensure it is 24 V DC.
• Inspect for Damage: Look for any visible signs of damage or wear on the valve and its components.
• Test Relay: If using a relay module, test it separately to ensure it is functioning correctly.

By following this documentation, users can effectively integrate and troubleshoot the 24 V DC Solenoid Valve NC in their projects, ensuring reliable and efficient fluid control.