曝光臺 注意防騙 網曝天貓店富美金盛家居專營店坑蒙拐騙欺詐消費者

shown on the knob placard.
AIR CONDITIONING - COOLING - TEMPERATURE CONTROL VALVE
EFFECTIVITY
GUN 001-099, 201-999 21-50-00
Page 98.32
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-825
AIR CONDITIONING - COOLING - TEMPERATURE CONTROL VALVE
AIR CONDITIONING - COOLING - TEMPERATURE CONTROL VALVE
EFFECTIVITY
GUN 001-099, 201-999 21-50-00
Page 98.33
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-825
Purpose
The standby temperature control valve does these things:
* Gives backup control for the discharge temperature of the air
conditioning pack (normal temperature control system
failure)
* Increases the temperature of pack discharge air to prevent
ice formation in the condenser.
Location
There are two standby temperature control valves, one for each
air conditioning pack. They are in the air conditioning pack
compartments.
Physical Description
The standby temperature control valve has these parts:
* Valve flow body
* Electromagnetic control valve assembly
* Delta pressure servo control assembly
* Pneumatic actuator
* Position indicator
* Sense ports.
Two V-band clamps support the valve.
Functional Description
The valve is a pneumatically actuated butterfly-type modulating
and shutoff valve. It is spring-loaded to the closed position.
Control pressure to the actuator opens and modulates the
valve. The control pressure source is the upstream side of the
valve. These valve devices control the pressure to the valve
actuator:
* Electromagnetic control valve assembly
* Delta pressure servo control assembly.
A signal from the pack zone controller standby pack control
channel drives the electromagnetic control device.
Pneumatic lines sense condenser differential pressure and
drive the delta pressure servo control device. Ice in the
condenser increases the pressure differential.
If the electromagnetic and the delta pressure controls operate
at the same time, the device that gives the largest valve open
pressure will control.
Training Information Point
There is a position indicator on the standby temperature control
valve. The valve is normally in the closed position when the
pack is off.
AIR CONDITIONING - COOLING - STANDBY TEMPERATURE CONTROL VALVE
EFFECTIVITY
GUN 001-099, 201-999 21-50-00
Page 98.34
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-824
AIR CONDITIONING - COOLING - STANDBY TEMPERATURE CONTROL VALVE
AIR CONDITIONING - COOLING - STANDBY TEMPERATURE CONTROL VALVE
EFFECTIVITY
GUN 001-099, 201-999 21-50-00
Page 98.35
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-824
Functional Description
The standby temperature control valve is electrically and
pneumatically controlled and pneumatically operated.
If the condenser begins to ice, differential pressure across the
condenser is sensed. This differential pressure acts on the high
or low pressure delta P servo.
The servo operates a poppet valve to control the actuation
pressure that goes from the reference pressure regulator to the
pneumatic actuator. This opens the valve and increases the hot
air flow into the condenser. With the increased hot airflow, the
condenser will deice and the valve closes.
Electrical control of the standby temperature control valve is
part of the standby mode of operation. The standby temperature
control electrically moves a flapper in the electromagnetic
control valve to control actuation pressure to the pneumatic
actuator.
If there are simultaneous signals from the differential pressure
sensors and the electromagnetic control valve, the device with
the higher demand has priority.
AIR CONDITIONING - COOLING - STANDBY TEMPERATURE CONTROL VALVE - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 201-999 21-50-00
Page 98.36
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-826
AIR CONDITIONING - COOLING - STANDBY TEMPERATURE CONTROL VALVE - FUNCTIONAL DESCRIPTION
AIR CONDITIONING - COOLING - STANDBY TEMPERATURE CONTROL VALVE - FUNCTIONAL DESCRIPTION
　
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