The FVS090 (stands for Ford Variable Scroll). It (on auto models) has a variable evaporator core orifice, which is located at the position of the evaporator core orifice in the condenser-to-evaporator core pipe.
In addition to a calibrated orifice with fixed flow rate, the valve housing features a variable orifice. The flow of refrigerant through the variable orifice is regulated by the refrigerant temperature. Depending upon temperature, the bi-metal spring turns the metering orifice, resulting in the variable orifice being opened to a greater or lesser degree and thus regulating the flow rate to the evaporator core.
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Russ