Flow restrictor

Pneumatic components

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Symbol

Flow restrictor symbol with its parts named

What it does

It narrows the pipe. Less air gets through, so the piston moves more slowly.

It slows the air both ways.

Turn the screw to set the speed.

On the kit
Flow restrictor, as it is on the kit

Key words

Restrictor
Narrows the pipe to slow the air.
Bi-directional
Slows the air both ways.
Uni-directional
Slows the air one way only.

Print the A3 poster (PDF)

Sources & credits: Symbols drawn to ISO 1219, as used in N5 Engineering Science. Kit drawings by R Stewart, from the Matrix CP2080 kit. Full site credits are on the credits page. R Stewart - October 2026