To Enhance the understanding of a hydraulic system, a standardized color coding of flows and pressures was established by the Joint Industry Conference (JIC) and American National Standards Institute (ANSI).
RED
Signifies Operation system pressure.of of the fluid, often used for the piping extends form the pump, to the pressure relief valve, to the first component that restricts the flow.
BLUE
Blue is used to show the fluid is not restricted, indicating there is minimal fluid pressure
GREEN
Green signifies the intake fluid from piped form the reservoir to the pump.
YELLOW
Yellow illustrates the controlled (metered) fluid flow after it passed through the restriction valve.
ORANGE
Orange shows the fluid that has been reduced from the system pressure, such as the fluid at the output of a pressure regulated valve.
VIOLET indicates the increased fluid pressure as a result of a amplified system pressure. eg: Fluid at thee output of the intensifier.
WHITE is to show is the fluid pressure in the system is zero or no pressure. Eg: fuild at the output of the intensifier when pump its not operational.