3/2 diaphragm valve

Pneumatic components

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Symbol

3/2 diaphragm valve symbol with its parts named

What it does

Low-pressure air at port 12 pushes the diaphragm. Air flows from port 1 to port 2.

It can sense an air bleed. Cover the open pipe and the valve works.

On the kit
3/2 diaphragm valve, as it is on the kit

Key words

3/2 valve
A valve with 3 ports and 2 positions.
Actuator
The part that works the valve.
Signal
Air sent to make the next part work.
Pneumatic
Worked by air.
Diaphragm
A rubber disc. Air pushes it to work the valve.
Air bleed
An open pipe. Cover it and the valve works.

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