US Patent 7624930 Temperature-type expansion valve

A temperature-type expansion valve 1 includes a valve housing 110 having a first passage 121 into which a high pressure refrigerant flows, a second passage 122 through which a low pressure refrigerant flowing to an evaporator 5 flows, and a throttle passage 125 communicating the first passage 121 with the second passage 122; a valve body 130 having a valve member 131 varying a sectional area of the throttle passage 125; and an operation rod 135 for driving the valve body 130 in the interlocking arrangement with a displacement member 160 undergoing displacement in accordance with a pressure difference between a saturation pressure corresponding to an outlet temperature of the refrigerant of the evaporator 5 and an evaporation pressure of the evaporator; wherein a slide hole 124 communicating with the throttle passage 125 and accommodating the valve body 130 is formed in the valve housing 110; and the valve member 131 moves inside the slide hole 124 in the interlocking arrangement with the operation rod 135 to thereby adjust the sectional area of the throttle passage 125. Construction can be simplified and the number of components can be decreased.