Differences Between AirTAC 3V and 4V Series – Which One Should You Choose?

In pneumatic and automation systems, selecting the correct AirTAC solenoid valve plays a crucial role in ensuring operational efficiency, system stability, and equipment lifespan. The two most commonly used series are 3V and 4V, but each has completely different structures, functions, and applications.

This article helps you clearly understand the differences between AirTAC 3V and 4V solenoid valves, so you can choose the right option for your system requirements.

1. Overview of AirTAC 3V and 4V Series

AirTAC 3V Series – 3/2-Way Solenoid Valve

The AirTAC 3V series is a 3-port, 2-position (3/2-way) solenoid valve, designed for simple pneumatic systems.

1. Structure: 3 ports (in – out – exhaust)
2. Function: On/off control of one-way airflow
3. Application: Single-acting cylinder
4. Port size: M5 or 1/8”
5. Cv: Low flow rate, suitable for small air consumption

👉 According to the 3V100 catalog, this valve features a compact design, operates under 0.15 – 0.8 MPa pressure, and is ideal for simple control systems.

AirTAC 4V Series – 5/2 & 5/3-Way Solenoid Valve

The AirTAC 4V series is a 5-port, 2-position or 3-position (5/2, 5/3-way) solenoid valve, widely used in industrial applications.

1. Structure: 5 ports (1 supply – 2 working – 2 exhaust)
2. Function: Directional control of airflow (reverse motion)
3. Application: Double-acting cylinder
4. Port size: 1/8” – 1/4”
5. Cv: Medium to high flow rate

👉 According to the 4V100 catalog, this series is designed for automation systems requiring higher airflow capacity and more complex control functions.

2. Detailed Comparison Between 3V and 4V Series

2.1 Port Structure

1. 3V: 3 ports – 2 positions
2. 4V: 5 ports – 2 or 3 positions

👉 The 4V series is more complex and offers greater control flexibility.

2.2 Compatible Cylinder Type

1. 3V → Single-acting cylinder
2. 4V → Double-acting cylinder

👉 This is the most important difference when selecting a valve.

2.3 Working Principle

3V Series:

1. Controls airflow in one direction
2. Does not reverse piston movement

4V Series:

1. Reverses piston direction (extend/retract)
2. Can hold a middle position (5/3-way)

2.4 Flow Rate (Cv) & Port Size

3V Series:

1. Port size: M5 / 1/8”
2. Low Cv → suitable for small loads

4V Series:

1. Port size: 1/8” – 1/4”
2. Higher Cv → suitable for industrial systems

👉 Higher Cv means higher airflow and faster cylinder speed.

2.5 Practical Applications

3V Series:

1. Mini packaging machines
2. Simple pneumatic systems
3. Small automation devices

4V Series:

1. Production lines
2. Industrial robots
3. CNC machines and automation systems

3. Should You Choose 3V or 4V?

Choose 3V if:

1. The system is simple
2. You only need single-acting cylinders
3. Low airflow is required
4. Cost efficiency is a priority

Choose 4V if:

1. The system is automated
2. You use double-acting cylinders
3. Piston reversal is required
4. High speed and stable performance are needed