Symbol 3336 from ISO 7000 - Title/Meaning: SCV (selective control valve) - Number 1 Function/description: To identify the first selective control valve on the machine. To identify the control for the first SCV.
pay attention to orientation of symbolAdditional information: 
Arabic numeral may be substituted for Roman numeral
Other Roman or Arabic numerals may be used to identify additional selective control valves.
Own work using: iso.org/obp/graphics/grs/ae060de8-34a5-4797-91d9-2c5faa2de618 200.png
Vectorization:  Mrmw