This Standard specifies graphical symbols in diagrams for- mechanical elements such as weights, springs, clutches and brakes,- pipe and duct elements such as restrictors, nozzles and air vents, and- devices for storage such as tanks, pressure vessels and gas bottles.
ASME Y14.40.7-2002 history
2002ASME Y14.40.7-2002 Graphical symbols for diagrams - Part 7: Basic mechanical components