3/2 plunger valve

Pneumatic components

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Symbol

3/2 plunger valve symbol with its parts named

What it does

A moving part pushes the plunger in: air flows from port 1 to port 2.

Released: the spring pushes the valve back. Air in port 2 escapes through port 3.

What it looks like
3/2 plunger valve, drawn

Key words

3/2 valve
A valve with 3 ports and 2 positions.
Actuator
The part that works the valve.
Port
A numbered hole where a pipe joins.
Signal
Air sent to make the next part work.
Mechanical
Worked by a moving part.

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Sources & credits: Symbols drawn to ISO 1219, as used in N5 Engineering Science. Drawings by R Stewart. Full site credits are on the credits page. R Stewart - October 2026