R **ON A/C 151-199, 401-499,
A solenoid is installed on a bracket in each pylon. It is connected by a sense line to the HPV-PRV coupling sense line. When the engine is used with the old engine bleed air design, the Thrust Specific Fuel Consumption (TSFC) increases. This is because of low IP engine pressures give permanent HP bleed. To avoid this, during cruise with normal bleed condition:
-Wing Anti-Icing (WAI) not selected ON,
-Normal bleed configuration (2bleeds, 2 packs),
-Ps3 more than or equal to 80 psig,
High Pressure Bleed Valve
Figure 009
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High Pressure Bleed Valve
Figure 009A
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-Altitude over 15000ft, The solenoid is energized by the Bleed monitoring computer (BMC). It opens to ambient the HPV-PRV coupling sense line which lets HPV controlled close pneumatically.
**ON A/C 001-003, 051-054,
(2) Detailed Description
(Ref. Fig. 010)
The HP bleed valve contains three main parts :
-
a valve body,
-
a pneumatic actuator,
-
a regulator assembly.
(a)
Regulation The HP bleed valve upstream pressure supplies chamber (1) of the regulator through a jet to control the position of the clapper
(2) and maintain constant air pressure in the HP bleed valve actuator opening chamber. The test intake is used for checking correct valve operation on the ground by directly supplying the regulator. The HP bleed valve downstream presure supplies the HP bleed valve actuator closing chamber through distribution clapper (3). Indeed when downstream pressure reaches the value determined by spring preloading.
(b)
Opening/closing reduced pressure air supplies chamber (4) of the opening/closing sub assemblythough a jet to control the position of clapper (5) against its lower seat position and allow the HP bleed valve actuator opening chamber supply with reduced pressure air. When chamber (4) is vented to ambient the clapper (5) leaves its lower seat position and reduced pressure air is allowed to supply the HP bleed valve actuator closing chamber (by unseating the springloaded ball).
(c)
Overpressure Safety device When upstream pressure reaches a specified value, clapper (6) vents to ambient chamber (4) of the opening/closing subassembly and plugs upstream pressure regulator inlet. This causes the HP bleed valve to close.
(d)
Not Applicable
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High Pressure Bleed Valve - Schematic
Figure 010
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(2) Detailed Description
(Ref. Fig. 010A)
The HP bleed valve contains three main parts :
-
a valve body,
-
a pneumatic actuator,
-
a regulator assembly.
(a)
Regulation The HP bleed valve upstream pressure supplies chamber (1) of the regulator through a jet to control the position of the clapper
(2) and maintain constant air pressure in the HP bleed valve actuator opening chamber. The test intake is used for checking correct valve operation on the ground by directly supplying the regulator. The HP bleed valve downstream presure supplies the HP bleed valve actuator closing chamber through distribution clapper (3). Indeed when downstream pressure reaches the value determined by spring preloading.
(b)
Opening/closing reduced pressure air supplies chamber (4) of the opening/closing sub assemblythough a jet to control the position of clapper (5) against its lower seat position and allow the HP bleed valve actuator opening chamber supply with reduced pressure air. When chamber (4) is vented to ambient the clapper (5) leaves its lower seat position and reduced pressure air is allowed to supply the HP bleed valve actuator closing chamber (by unseating the springloaded ball).
(c)
Overpressure Safety device When upstream pressure reaches a specified value, clapper (6) vents to ambient chamber (4) of the opening/closing subassembly and plugs upstream pressure regulator inlet. This causes the HP bleed valve to close.
(d)
A safety valve attached to the cover protects the pneumatic actuator against overpressure in case of HP bleed valve failed open.
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