Ball check valve

ISO 10628-2 (group 22, check valves) / PIP PIC001

Drawn as

An open triangle pointing downstream at a small black ball, which sits against a vertical bar (the seat).

Meaning

Check valve with a free ball. Used on small lines, metering-pump discharges and chemical injection. No dedicated component; use check-valve-piston if it must be modelled.

Variants

Some legends draw a bow-tie with a filled circle in the outlet side
Injection check valves at the quill are often drawn as this symbol