Symbol 0234 from ISO 7000 - Title/Meaning: Valve; shut-off element 
Function/description: To identify any kind of shut-off valve. To indicate the opening or closing of a valve.
Own work using: iso.org/obp/graphics/grs/c13e4f12-b186-45e9-a05e-5d3d30790e21 200.png
Vectorization:  Mrmw