Based on the Number of Ports:
Two-Way Pneumatic Valve (2/2): Features two ports, serving as a simple on/off switch in pneumatic systems.
Three-Way Pneumatic Valve (3/2): With three ports, suitable for basic on/off applications and directional control.
Four-Way Pneumatic Valve: Controls with two or three positions, often used for directing flow.

Five-Way Valve: Functions similarly to a 4-way valve but includes an extra tank or exhaust port.
Based on Switching Positions:
Two-Position Pneumatic Valve: Has two stable positions, typically open and closed.
Three-Position Pneumatic Valve (3/2 or 5/3): Offers three stable states for more flexible airflow control.
Four-Position Pneumatic Valve (5/4 or 7/4): Provides four stable positions, enabling precise control.
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