application_number US 29942789 A description with reference to fig1 an expansion valve 10 is illustrated which forms a first embodiment of the present invention the expansion valve 10 is a component of an air conditioning system 12 for installation in an automobile the system 12 includes a refrigerant compressor 14 which is commonly driven by the engine compressor 14 will compress the refrigerant typically r12 or other suitable halogenated hydrocarbon the compressor output is provided to a condenser 16 and receiver dryer 18 before flowing to the compressor side high pressure refrigerant flow port 20 in valve 10 as will be discussed in detail hereinafter the refrigerant flow is regulated and its pressure decreased through the valve for exit from the evaporator side pressure refrigerant flow port 22 for delivery to the evaporator 24 the low pressure refrigerant flow from the evaporator flows to an evaporator side low pressure refrigerant flow port 26 in valve 10 passes through valve 10 and exits the valve at compressor suction side low pressure refrigerant flow port 28 for return to the compressor the valve 10 includes a body 30 formed of a resin material such as polyacetal homopolymer polyacetal copolymer glass fiber reinforced polybutylene terephthalate pbt or a glass fiber reinforced polyphenylene sulfide for normal heat resistance requirements if the heat resistance requirements are severe the body can be formed of metal such as an aluminum alloy a first passage 32 is formed through the body 30 between ports 26 and 28 and is centered along axis 34 a second passage 36 extends from a threaded end.