| 摘要 |
PURPOSE:To make it possible to send refrigerant to an evaporator even when its degree of superheat is small by giving an additional power to a valve disk pushing power based on a superheat signal and an amount of diaphragm deflection when a differential pressure between the upper stream side and the lower stream side of refrigerant is larger than a reference differential pressure which sets a superheat degree at a rest. CONSTITUTION:When a liquid flows at a pressure higher than a certain differential pressure against the power of a power element which affects the opening/ closing of a valve, the size of a valve port 10 is made sufficiently larger in terms of an effective size of a diaphragm 2 of a power element so that the valve may be opened, and a valve disk is designed to be a cone-shaped valve so that the power produced by the flow of a fluid may be taken out effectively, then the apex angle of the cone is determined. Therefore, when the vaporization temperature or the vaporization pressure is lower as a result of deviation from the superheat characteristics a standard state valve lift (valve opening area), the valve can be opened even with a superheat degree signal which has not reached the degree of statical superheat and refrigerant is supplied to an evaporator. |
