In that diagram, what you're seeing is a portion of the pneumatic system, showing that the bleed air from the APU can be routed to both air conditioning packs (on many aircraft the APU can power both AC packs on the ground; on some aircraft it can only power one at a time), as well as to the engines, where it provides
Also, how does an auto bleed valve work?
An automatic bleeding valve or air release valve (ARV) is a plumbing valve used to automatically release trapped air from a heating system. Air, or other gas, may collect within plumbing. For water delivery systems to taps and basins, this air is flushed through with the water flow and does not cause a problem.
What is the use of bleed valve in gas turbine?
If the airflow is too much into the engine while the fuel flow is still low (at IDLE conditions), it may extinguish the flame or stall the compressor (which is turning at low speeds at low power settings). To avoid this an outlet valve is installed at the end of the N1 or N2 compressor to 'bleed' this excess air out.
What do you need to bleed brakes?
If your vehicle has squishy-feeling brakes, the way to get the air out of the lines is to bleed the brakes. To do the job, you need either a brake bleeder wrench or a combination wrench that fits the bleeder nozzle on your vehicle, a can of the proper brake fluid, a clean glass jar, and a friend.