R 1EFF : 401-499, 1 36-11-00Page 88 1 1 Aug 01/05 1 1 1CES 1R Bleed Pressure Regulator Valve Control Solenoid - Schematic R Figure 024B
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E. Overpressure Valve (OPV)
(Ref. Fig. 025)
(1)
The OPV is a 4 in. dia. butterfly-type valve, whose operation is fully pneumatic. In normal conditions the valve is spring-loaded open.
(2)
Detailed Description
(Ref. Fig. 026)
The OPV contains two main parts :
-a valve body
-an actuator assembly.
(a)
Regulation When the upstream pressure increases and reaches 75 psig, the OPV starts to close (pressure on the piston overcomes the spring force). This decreases the air flow and so reduces the downstream pressure. At 85 psig upstream pressure the OPV is fully closed, it opens again when the upstream pressure has decreased to less than or equal to 35 psig.
(b)
Safety devices and indications The OPV is equipped with a test port which serves to perform an "in situ" test. A microswitch in the OPV signals the extreme open position.
(3)
Controls and Indicating OPV operation is fully pneumatic. It cannot be controlled from the cockpit.
R **ON A/C 004-049, 055-099, 101-149, 151-199, 201-299, 301-399, 401-499,
E. Overpressure Valve (OPV)
(Ref. Fig. 025A)
(1) The OPV is a 4 in. dia. butterfly-type valve, whose operation is fully pneumatic. In normal conditions the valve is spring-loaded open.
Overpressure Valve (OPV)
Figure 025
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Overpressure Valve (OPV)
Figure 025A
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Overpressure Valve (OPV) - Schematic
Figure 026
R 1EFF : 001-003, 051-054, 1 36-11-00Page 93 1 1 Aug 01/05 1 1 1CES 1
(2)
Detailed Description
(Ref. Fig. 026A)
The OPV contains two main parts :
-a valve body
-an actuator assembly.
(a)
Regulation When the upstream pressure increases and reaches 79 psig, the OPV starts to close (pressure on the piston overcomes the spring force). This decreases the air flow and so reduces the downstream pressure. At 85 psig upstream pressure the OPV is fully closed, it opens again when the upstream pressure has decreased to between 20 and 57 psig.
(b)
Safety devices and indications The OPV is equipped with a test port which serves to perform an "in situ" test. A microswitch in the OPV signals the extreme open position.
(3)
Controls and Indicating OPV operation is fully pneumatic. It cannot be controlled from the cockpit.
**ON A/C ALL
F. Bleed Air Precooler Exchanger
(Ref. Fig. 027)
(1)
The precooler exchanger is a tubular steel assembly with crossflow air routing configuration.
(2)
Detailed Description
(a) Function The precooler assures cooling of the hot air bled from the engine compressors by a heat exchange process using cold air from the engine fan.
G. Fan Air Valve (FAV)
**ON A/C 001-003, 051-054,
(Ref. Fig. 028)
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Overpressure Valve (OPV) - Schematic
Figure 026A
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Bleed Air Precooler Exchanger Figure 027
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Fan Air Valve (FAV) Figure 028
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R **ON A/C 004-049, 055-099, 101-149, 151-199, 201-299, 301-399, 401-499,
(Ref. Fig. 028A)
**ON A/C ALL
(1)
The FAV is a 5.5 in. dia. butterfly-type valve, normally spring -loaded closed in the absence of pressure. A minimum upstream pressure of 8 psig is necessary to open the valve. The FAV regulates the dowstream precooler exchanger temperature to 200 plus or minus 15 deg.C (27 deg.F).
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