3V vs 4V Directional Control Valves: Main Differences
For many pneumatic machines, the model number on a valve looks simple, but the function behind it decides how the actuator moves. The 3V110, 3V210, 3V310 and 3V410 valves are normally used as 3/2 way air solenoid valves, while 4V110, 4V210, 4V310 and 4V410 valves are normally used as 5/2 way directional control valves. Both groups belong in the solenoid valve category, but they solve different circuit problems. The practical difference is the actuator type. A 3V valve is usually selected for a single-acting cylinder, air blow control, signal air, or a small pneumatic device that needs supply and exhaust through one working port. A 4V valve is usually selected for a double-acting cylinder that needs two cylinder ports to switch between extension and retraction. Port Function Is the First Difference A 3V series valve has three ports and two positions. One port receives supply air, one port connects to the actuator or output line, and one port exhausts air when the valve switches back. This layout makes the valve suitable for single-acting cylinders because the spring inside the cylinder…
