Patent ID: 7299995
Filing Date: 2007-11-27
Classification: F25B

Abstract:
1. An expansion valve, in which a valve plug is driven by means of a temperature sensing unit which operates in accordance with the temperature and pressure of a low-pressure refrigerant delivered from an evaporator and adjusts the flow rate of refrigerant flowing into the evaporator, comprising: constraint means for applying a force of constraint to the valve plug or an operating rod for opening and closing the valve plug, the constraint means being attached to the valve plug or the operating rod, wherein the valve plug is spherical, and the constraint means is a support ring supporting the valve plug or the operating rod, the support ring is formed of upper and lower circular annular portions and vibration-proof plate springs cut out of the annular portions and each said vibration-proof spring is formed having a portion to be in pointed contact with the operating rod.