Expansion valve unit having pressure detecting function

An expansion valve unit having a pressure detecting function, comprising:

• a supercooling control expansion valve disposed in a flow path of a refrigerant sent into an evaporator of a refrigeration system constituting a refrigerating cycle to control a flow rate of the refrigerant;
• a pressure detector provided at one end of the supercooling control expansion valve to detect a pressure of the refrigerant sent thereto through a refrigerant passage in said supercooling control expansion valve;
• joining means for integrally joining said pressure detector to said supercooling control expansion valve;
• a hermetic seal member disposed near a joint between said supercooling control expansion valve and said pressure detector to prevent leakage of the refrigerant;
• a power element chamber provided in a block constituting a base body of said supercooling control expansion valve, said power element chamber being defined by a diaphragm and having a refrigerant sealed therein to control a degree of opening of a valve element of said supercooling control expansion valve;
• a first space formed adjacently to said power element chamber, said first space communicating with said refrigerant passage, wherein said first space is filled with a high-temperature and high-pressure refrigerant and disposed closer to said pressure detector than said power element chamber;
• and
• a second space formed adjacently to said first space on a side thereof closer to said pressure detector;
• wherein said pressure detector is disposed between said first space and said second space to detect a pressure of the high-temperature and high-pressure refrigerant on a basis of a pressure difference between said first space and said second space.