AirTAC Solenoid Valve Not Actuating – Causes and How to Fix It

In pneumatic and automation systems, AirTAC solenoid valves are critical devices used to control cylinders, actuators, and other pneumatic components. When a valve fails to actuate, the piston does not move, cylinders stop, and the entire system becomes unbalanced. This phenomenon directly affects system performance, equipment lifespan, and operational efficiency

1. Introduction to Valve Non-Actuation

1. A solenoid valve not actuating occurs when the valve does not change state even though the coil and power supply are active.
2. Consequences include:Piston does not move or moves slowly
3. Cylinders fail to operate accurately
4. Valve may vibrate, coil heats up, and system pressure becomes unstable

Understanding the causes allows for quick troubleshooting, saving time and maintenance costs.

2. Causes of Solenoid Valve Not Actuating

2.1 Incorrect Coil Voltage

1. Using the wrong coil voltage (AC220V, AC110V, DC24V, DC12V) → coil cannot generate enough pull → valve fails to actuate.
2. Fix: Check the AirTAC catalog and select the correct voltage according to the valve model and system supply.

2.2 Valve Stuck or Spool/Piston Contaminated

1. Piston or spool contaminated with dust, oil, or debris → valve cannot actuate → coil energized continuously but inefficiently → overheating.
2. Fix: Perform regular cleaning and use an air filter ≤ 40 μm.

2.3 Improper Coil Wiring

1. Incorrect connection of vertical or parallel plug wires
2. Wrong coil type or polarity
3. Consequences: Valve fails to actuate, coil heats up or burns
4. Fix: Connect according to the catalog, correct polarity, and use the proper voltage.

2.4 Wrong Series or Model

1. Installing a 3V valve on a 4V manifold → pressure and flow mismatch
2. Coil overloaded → damaged, valve fails to actuate
3. Fix: Choose the correct series (3V/4V/5V) and model according to the AirTAC catalog.

2.5 Environmental and Temperature Issues

1. Ambient temperature > 60°C or continuous operation → coil overheats → valve does not actuate
2. Fix: Maintain temperature ≤ 60°C, install a cooling fan if necessary, and operate valves in proper duty cycles.

3. How to Fix a Non-Actuating Valve

3.1 Check Port Size and Cv

1. Ensure the port size and Cv are compatible with the cylinder and system.
2. Reference the AirTAC catalog to select the correct model.

3.2 Clean or Replace Seals and Pistons

1. Remove dust and oil buildup
2. Replace worn seals
3. Prevent coil overloading due to stuck spools

3.3 Correct Installation Techniques

1. Tighten screws to the proper torque to avoid cracking the valve body or threads
2. Connect coil properly using vertical or parallel plug wire
3. When using a manifold, ensure all valves are of the same series and port size

3.4 Regular Maintenance and Air Filtration

1. Use an air filter ≤ 40 μm
2. Clean spool, piston, and air lines periodically
3. Inspect manifold and the full pneumatic system

3.5 Use Correct Series and Model

1. Use the correct 3V / 4V / 5V series
2. Avoid mixing series on the same system → maintains consistent pressure and flow

4. Common Mistakes Leading to Non-Actuating Valves

1. Incorrect port size or Cv: piston moves slowly, valve vibrates, pressure drops
2. Wrong series or model: valves not synchronized
3. Wrong coil voltage: valve does not actuate, coil overheats
4. Not consulting the catalog: leads to incorrect installation → reduces valve lifespan