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REFRIGERANT COMPONENTS ALL MODELS
25
Figure
Float Type Flow Valve
enough to close the valve and stop the flow of refrig-
erant liquid.
For the sake of simplicity, we have described the
float and valve action as being in a sort of definite
wide open or tight shut condition. Actually, though,
the liquid level falls rather slowly as the refrigerant
boils away. Likewise, the float goes down gradually
and gradually opens the valve just a crack. New
refrigerant liquid barely seeps in through the
“cracked” valve. At such a slow rate of flow, it
raises
the liquid level in the evaporator very slowly.
With that in mind, it is easy to see
how it
would be
possible for a stabilized condition to exist. By that,
we mean a condition wherein the valve would be
ACTUATING
PLATE
PINS \
t
PASSAGE
SEAT
ORIFICE
AGE SPRING
ELEMENT
SPRING SEAT
OUTLET
opened barely enough to allow just exactly the right
amount of refrigerant liquid to enter the freezer to
take the place of that leaving as a vapor.
Thermostatic Expansion Valve
Automotive air conditioning systems use a thermo-
static expansion valve in place of the float system.
Figure
shows a cross-section of the valve
which consists primarily of the gas-filled power ele-
ment, body, actuating pins, seat and orifice. At the
high pressure liquid inlet is a tine mesh screen which
prevents dirt, tilings or other foreign matter from
entering the valve orifice.
When the valve is connected in the system, the high
pressure liquid refrigerant enters the valve through
the screen from the receiver-dehydrator (which acts
as a storage tank for the condensed refrigerant as it
leaves the condenser) and passes on to the seat and
orifice. Upon passing through the orifice the high
pressure liquid becomes low pressure liquid. The low
pressure liquid leaves the valve and flows into the
evaporator core where it absorbs heat from the
evaporator core and changes to a low pressure vapor,
and leaves the evaporator core as such. The power
element bulb is clamped to the low pressure vapor
line just beyond the outlet of the evaporator (Fig.
The operation of the valve is quite simple. It is a
matter of controlling opposing forces produced by a
spring and the refrigerant pressures. For example:
The pressure in the power element is trying to push
the seat away from the orifice, while the spring is
trying to force the seat toward the orifice. These
opposing pressures are established in the design of
the valve so that during idle
periods, i.e.
when the
system is not operating, the spring force and the
refrigerant pressure in the cooling coil are always
Figure
Thermostatic Expansion Valve
Figure
Expansion Valve Bulb Location
Summary of Contents for 1900 1973
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Page 48: ...IGNITION SYSTEM lC 27 9 3OlC19 Figure 1 C l 3 Distributor Exploded...
Page 57: ...I I 1 D 36 1973 OPEL SERVICE MANUAL I Figure 1 D 27 Alternator Exploded View 301D27...
Page 95: ...j 1J 74 1973 OPEL SERVICE MANUAL i I m Figure 13 1 Windshield Wiper and Horn Opel 1900 Manta...
Page 96: ...I I WIRING DIAGRAMS lJ 75 Figure lJ 2 Windshield Wiper and Horn Rallye...
Page 97: ...1 J 76 1973 OPEL SERVICE IMANUAL L J Figure lJ 3 Wind hield Wiper and Horn Gl...
Page 98: ...I I I WIRING DIAGRAMS 1J 77 I I Figure 1 J 4 Turn Signal and Hazard Flasher Opel 1900 Manta I...
Page 99: ...I i L I lJ 78 1873 OPEL SERVICE MANUAL Figure lJ 5 Turn Signal and Hazard Flasher GT...
Page 100: ...I WIRING DIAGRAMS 15 79 I I Figure lJ 6 Oil Fuel Temp Tach Stop and Brake Warning Light GT I...
Page 101: ......
Page 102: ...I WIRING DIAGRAMS lJ 81 r Figure 1 J 8 Blower and Lighter GT...
Page 103: ...I I lJ 82 1973 OPEL SERVICE MANUAL Figure lJ 9 indicator Lights and Gauges Opel 1900 Manta...
Page 104: ...I I WIRING DIAGRAMS IJ 83 I Figure 1 J 10 Indicator Lights and Gauges Ratlye...
Page 106: ...EhMB SWITCH R GHiDOOR 301J12...
Page 107: ...1 J 86 1973 OPEL SERVICE MANUAL i Figure 1 J l 3 Headlamps Opel 1900...
Page 108: ...I I I WIRING DIAGRAMS lJ 87 Figure lJ 14 Headlamps Manta...
Page 109: ...1 J 88 1973 OPEL SERVICE MANUAL I 1 Figure lJ 15 Headlamp and Fog Lights Rallye...
Page 110: ...301516...
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Page 113: ...1 J 92 1973 OPEL SERVICE MANUAL d 5 Figure 1 19 Starting lgniiion and Charging Opel 1900 Manta...
Page 114: ...I I WIRING DIAGRAMS lJ 93 I Figure lJ 20 Starting Ignition and Charging GT...
Page 115: ...1 J 94 1973 OPEL SERVICE MANUAL i I I Figure lJ 21 Instrument Panel GT...
Page 116: ...I I 1 I WIRING DIAGRAMS lJ 95 Figure lJ 22 A C Generator and Regulator All Models...
Page 117: ...301523...
Page 119: ...I I I 10 RED AMP GAGE 301J25...
Page 120: ...WIRING DIAGRAMS lJ 99 Figure lJ 26 Seat Belt Warning System Automatic Transmissionl GT...
Page 121: ...lJ 100 1973 OPEL SERVICES MANUAL I Figure 1 J 27 Heated Rear Glass Opel 1900 Manta...
Page 122: ...I WIRING DIAGRAMS 1 J 101...
Page 123: ...1 J 102 1973 OPEL 9ER IC MANUAL...
Page 128: ...SPECIAL BODY TOOLS GENERAL INFORMATION 2A 5 W REGULATOR INING INSTALLER J 21828 J 21549 2A 1...
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Page 285: ...5C 26 1973 OPEL SERVICE MANUAL...
Page 322: ...ENGINE MECHANICAL AND MOUNTS 6A 31...
Page 350: ...CARBURETOR AND THROTTLE LINKAGE 6E 59 Figure 6E 37 Carburetor Specifications...
Page 361: ......
Page 372: ...Figure 7A 9 Exploded View of Clutch Pedal and Housing...
Page 423: ...Third Clutch Applied Low Band Released...
Page 424: ...AUTOMATIC TRANSMISSION C 63...
Page 425: ...712 64 1973 OPEL SERVICE MANUAL HYDRAULIC OPERATION I r n...
Page 427: ...7C 66 1973 OPEL SERVICE MANUAL...
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Page 429: ...7C 68 1973 OPEL SERVICE MANUAL II II I...
Page 431: ...7C 70 1973 OPEL SERVICE MANUAL d...
Page 433: ...7C 72 1973 OPEL SERVICE MANUAL...
Page 435: ...7C 74 1973 OPEL SERVICE MANUAL...
Page 437: ...712 76 1973 OPEL SERVICE MANUAL...
Page 439: ...a 1973 OPEL SERVICE MANUAL...
Page 441: ...7C 80 1973 OPEL SERVICE MANUAL...
Page 499: ...7C 138 1973 OPEL SERVICE MANUAL 4 5 I Figure 7C 234 Special Tools Automatic Transmission 7C223...
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Page 596: ...98 88 1973 OPEL SERVICE MANUAL Figure gB 165 Special Tools...
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