Patent ID: 6305179
Filing Date: 2001-10-23
Classification: F25B

Abstract:
An expansion valve in a refrigerating cycle comprising:a compressor with a variable capacity corresponding to variations of the compressor inhalation pressure;an expansion valve having a valve body disposed in a high pressure passage for high-pressure refrigerant supplied to an evaporator adjacent to a valve seat bore formed by a contraction in a middle portion of the high pressure passage;wherein the position of the valve body is controlled between a fully closed state and an opened state corresponding to variations of temperature and pressure of low-pressure refrigerant exiting the evaporator and passing through the expansion valve in a low-pressure passage;wherein a variation of a cross-section of the high pressure passage between the valve body and the valve seat bore for a first stroke increment of a lift stroke of the valve body from the fully closed state to an intermediate opening state position is smaller than a variation of the cross-section of the high pressure passage for a second stroke increment of the lift stroke from the intermediate opening state position to the opened state.