 To enhance the understanding of a hydraulic system, a standardized color coding of flows and pressure was established by the Joint Industry Conference and the American National Standards Institute. Red signifies the operating system pressure of the fluid. It is often used for the piping that extends from the pump to the pressure relief valve to the first component that restricts the flow. Blue is used to show the fluid that is not restricted, indicating there is minimal fluid pressure. For example, blue would be used in the piping for the fluid that exhausts from an extended piston. Green signifies the intake fluid that is piped from the reservoir to the pump. Yellow illustrates the controlled fluid flow after it passes through a restriction valve. Orange shows the fluid that has been reduced from the system pressure such as the fluid at the output of a pressure-regulating valve. Violet indicates the increased fluid pressure as a result of the amplified system pressure. An example of this kind of increased fluid pressure is the fluid at the output of the intensifier. White is used to show the fluid pressure in a system that has no pressure. An example is the fluid at the output of the intensifier. Since the pump is off, there is no fluid pressure in the system. You have completed this activity, the hydraulic color code.