Metering (dosing) pump

ISO 10628-2 (group 15, liquid pumps) / PIP PIC001 / API 675

Drawn as

A pump circle with an internal triangle and a long diagonal arrow through it (adjustable capacity); diaphragm heads may be drawn as a curved line inside.

Meaning

Diaphragm or plunger metering pump (API 675): chemical injection, methanol, corrosion inhibitor. Usually part of the chemical injection package. Becomes metering-pump.

Variants

Some legends write "MP" or draw a diaphragm arc on the head
Multi-head pumps are drawn as several circles on one driver