Although the cap tube has no valve or adjustable orifice, it does provide some control of refrigerant flow to the evaporator. It should be noted, though, that this control capability is limited to a very narrow range.
An increase in the load on the evaporator causes an increase in the evaporator pressure. This in turn causes liquid to back up in the condenser where it undergoes additional sub-cooling. Because the refrigerant subsequently arrives at the evaporator at a lower temperature, it is able to absorb more of the load.
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