The High Pressure (HP) manifold is composed of:- two pressure switches,- a pressure transducer,- a leak measurement valve,- a HP filter,- a priority valve,- a pressure relief valve,- a sampling valve.PRESSURE SWITCHESThe signals from both HP manifold pressure switches are sent to theECAM system and to the Flight Control Computers (FCCs). Thethreshold of the pressure switches is 1450 psi (99.5 bar).PRESSURE TRANSDUCERThe pressure transducer gives data for pressure indication on theECAM and sends information to ELevator Aileron Computers(ELACs) 1 and 2.LEAK MEASUREMENT VALVEThe leak measurement valve isolates the flight controls when theguarded LEAK MEASUREMENT VALVES P/B on the maintenancepanel is set to OFF.HP FILTERThe HP filter has a clogging indicator. The clogging indicator operateswhen the differential pressure is higher than 87 ± 8.7 psi (6 ± 0.6 bar).PRIORITY VALVEThe priority valve makes sure that all available hydraulic pressure issent to the primary flight controls if pressure in the system is reduced.The threshold of the priority valve is 1842 psi (127 bar).PRESSURE RELIEF VALVEThe pressure relief valve connects the HP circuit to the return circuitin case of over pressure. The relief valve opens at 3436 psi (237 bar)and closes at 3190 psi (220 bar).SAMPLING VALVEA sampling valve is installed on the HP manifold.NOTE: CAUTION: when sampling, let the fluid run for a momentinto a container, then put 0.2L (0.05USG) of fluid into anappropriate bottle for analysis.ACCUMULATORThe accumulator acts as a damper for small changes. It also makes asupply of fluid available if there is a demand. The accumulator ispre-charged with nitrogen to 1885 psi (130 bar) at 20°C. When it is full,it holds a total volume of fluid of 1.1 l (0.29 US gal) .