3/2 roller trip valve

Pneumatic components

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Symbol

3/2 roller trip valve symbol with its parts named

What it does

One way only. Pushed one way, the roller works the valve. Air flows from port 1 to port 2.

Pushed the other way, the hinge folds. Nothing happens.

What it looks like
3/2 roller trip 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.
Roller trip
A roller that works the valve one way only.

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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