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If your talking about an Orifice tube?, It is used to convert high pressure refrigerant to low pressure refrigerant which then enters the evaporator. As the blower motor pushes warm air thru the evaporator, the refrigerant turns from a liquid to a gas which cools the air.
R134a
Temperature glide
That would depend on the type of refrigerant that is being used.
The pressure should be equal to a saturated suction temperature of around 40*F. The pressure would differ depending on which refrigerant is used.
Disposable refrigerant containers are only used for virgin refrigerant.
The refrigerant cylinder is heated in a tub of water to no more than 90 degrees F. Electric heating blankets manufactured for this purpose may also be used.
Virtually all vehicles since 1994 use refrigerant r-134a. On a 97 Suburban, the suction (low pressure) and discharge (high pressure) ports are located on top of the compressor. Refrigerant is added to the low pressure side. It is attached to the larger refrigerant piping and hose which runs to the accumulator-drier at the firewall. The smaller high pressure pipe attaches to the condenser located in front of the radiator. Do NOT attach a refrigerant can to the high pressure line.
Freon is the brand of a type of refrigerant. A 1994 Toyota 4Runner uses R-134a type refrigerant which is the modern fluid used in air-condition systems.
The low pressure AC port on a 2000 Buick Century is located on the accumulator. It is used to fill the system with refrigerant and to check pressure levels.
Refrigerant are used in refrigerator for cooling and dehumidifying indoor air.
The compressor would continue to operate until the high pressure safety switch shut it down, if the switch failed the pressure relief device would blow and you would lose all of the refrigerant. As far as how high would the pressure get, the settings on the two devices depend on what type of refrigerant is used and you do not mention that.