Mechanical air valves regulate the flow of compressed air to
components connected to pneumatic systems. They are also referred to as directional control valves
and are classified by two numbers such as 3/2-way, 5/2-way and 5/3-way .
The first number indicates the number of ports of the mechanical valve and the
second number its “states”.
The mechanical air valve is a device that uses compressed air to
control the valve itself, while the media used within the
system may be something else, such as liquid or gas