Patent ID: 6223994
Filing Date: 2001-05-01
Classification: F25B

Abstract:
A thermal expansion valve having a refrigerant passage from an evaporator toward a compressor formed in an inner portion thereof and a temperature sensing and pressure transmitting member installed in the passage having a heat sensing function and forming a hollow portion in an inner portion thereof, wherein a distal end of the hollow portion of the temperature sensing and pressure transmitting member is fixed to a center opening portion of a diaphragm constituting a power element portion for driving the temperature sensing and pressure transmitting member, an upper pressure chamber within the power element portion formed by the diaphragm and the hollow portion are communicated with each other so as to form a sealed space having a working fluid charged therein, and a thermal-transfer-delay means is provided between a heat ballast member received in the hollow portion and an inner wall of the hollow portion.