DOC AIRBUS | TSM A320FHYDRAULIC RESERVOIR PRESSURIZING SYSTEM - TASK SUPPORTING DATA
** ON A/C NOT FOR ALL
1. System Description
Hydraulic Pressurizing System - SchematicA. Air Supply of the Reservoir Pressurization System
The reservoir pressurization system gets:
The reservoir pressurization system gets:
- HP air (usual operation)
- LP air (if failure of left engine occurs)
- ground supply air.
(1) A restrictor is installed in the HP bleed air line from the left engine. The restrictor limits the airflow to make sure that the temperature of the HP air is reduced to a satisfactory level. It also prevents too much bleed air leakage. This is necessary in case of a leak downstream of the restrictor.
(2) The system has a reservoir pressurization unit which controls the pressure of the air supplied to the reservoirs. This is necessary because the pressure of the HP air from the engine can be as much as 26 bar (377 psi) and the system operates at 4.5 bar absolute. The pressure of the LP bleed air is 3.5 bar relative. Thus it is not necessary to decrease the pressure of this air supply.
(3) A water separator is installed on the reservoir pressurization unit. The water separator is located upstream of the pressure reducing valve . The water separator makes sure that the air is clear of water. A reservoir presssurization ground connector is also installed on the unit. It makes it possible to pressurize the system from a ground service cart. A filter assembly is also installed on the unit.
(4) An air pressure gage is installed in each system, adjacent to the related reservoir. Each reservoir has a pressure relief valve to prevent overpressurization of the reservoir.
(5) Each reservoir has a reservoir depressurization valve to let the pressure out of the reservoir. The valve is installed in the related ground service panel.