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Bleed Pressure Regulator Valve (PRV) - Schematic
Figure 022A
R 1EFF : 004-049, 055-055, 057-099, 101-149, 1 36-11-00Page 78 1151-199, 201-299, 301-399, 401-499, 1Aug 01/05 1 1 1CES 1 The downstream pressure supplies the actuator closing chamber through distribution clapper (4). Indeed when downstream pressure reaches the value determined by spring preloading.
R **ON A/C 001-049, 052-099, 101-149, 151-199, 201-299, 301-399, 401-499,
(b)
Opening/Closing Reduced pressure air supplies chamber (5) of the opening/closing sub assembly though a jet to control the position of clapper (6) against its lower seat position and allow the HP Bleed Valve actuator opening chamber supply with reduced pressure air. When chamber (5) is vented to ambient the clapper (6) leaves its lower seat position and reduced pressure air is allowed to supply the HP Bleed Valve actuator closing chamber.
(c)
Safety devices and indications A thermal fuse (7) permits to vent to ambient chamber (5) of the opening/closing subassembly. This causes the valve to close. The PRV is equipped with an upstream pressure test port which permits you to perform an "in situ" test. A manual override permits you to close the valve mechanically on the ground. The microswitch in the valve signals the extreme position (closed) of the butterfly plate.
**ON A/C 051-051,
(b)
Opening/Closing Reduced pressure air supplies chamber (5) of the opening/closing sub assembly though a jet to control the position of clapper (6) against its lower seat position and allow the HP Bleed Valve actuator opening chamber supply with reduced pressure air. When chamber (5) is vented to ambient the clapper (6) leaves its lower seat position and reduced pressure air is allowed to supply the HP Bleed Valve actuator closing chamber.
(c)
Safety devices and indications A thermal fuse (7) permits to vent to ambient chamber (5) of the opening/closing subassembly. This causes the valve to close. The PRV is equipped with an upstream pressure test port which permits you to perform an "in situ" test. A manual override permits you to close the valve mechanically on the ground. The two microswitches in the valve signal the extreme positions (open/closed) of the butterfly plate.
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R **ON A/C 001-049, 052-099, 101-149, 151-199, 201-299, 301-399, 401-499,
(3) Control and Indicating PRV operation is fully pneumatic.The PRV can be controlled in close position from the AIR COND overhead control panel. The pushbutton switches (ENG 1 (2) BLEED) energize/de-energize the solenoid. The lower ECAM display unit indicates its position on the BLEED page. (Ref. Fig. 011) The two BMCs monitor the operation of the PRV (closed microswitch signal and regulated pressure level). They receive and process the signals and transmit the information per data bus by the SDAC to the ECAM system which generates the system display (Ref. 36-20-00). Additionally, they transmit the information to the CFDIU. The CFDIU generates maintenance information which is displayed on the MCDU if the MCDU MENU is selected. (Ref. Fig. 013)
**ON A/C 051-051,
(3) Control and Indicating PRV operation is fully pneumatic.The PRV can be controlled in close position from the AIR COND overhead control panel. The pushbutton switches (ENG 1 (2) BLEED) energize/de-energize the solenoid. The lower ECAM display unit indicates its position on the BLEED page. (Ref. Fig. 011) The two BMCs monitor the operation of the PRV (closed/open, microswitch signals and regulated pressure level). They receive and process the signals and transmit the information per data bus by the SDAC to the ECAM system which generates the system display (Ref. 36-20-00). Additionally, they transmit the information to the CFDIU. The CFDIU generates maintenance information which is displayed on the MCDU if the MCDU MENU is selected. (Ref. Fig. 013)
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
D. Bleed Pressure Regulator Valve Control Solenoid
**ON A/C 001-001, 051-052,
(Ref. Fig. 023)
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Bleed Pressure Regulator Valve Control Solenoid
Figure 023
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**ON A/C 002-049, 053-099, 101-149, 151-199, 201-299, 301-399,
(Ref. Fig. 023A)
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
(1) The bleed pressure regulator valve control solenoid is installed downstream of the precooler exchanger to control the bleed pressure regulator valve. It consists of: - a thermostat assembly - a solenoid valve assembly - a non return assembly.
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