Abstract: In a throttle device, a body portion has a flat surface at a position at a predetermined distance from its center axis. Thus, when a needle member is moving, a working pressure of a refrigerant present between an inner peripheral surface of a guide tube and the flat surface acts in a radial direction of the body portion and presses part of an outer peripheral surface of the body portion located opposite from the flat surface against the inner peripheral surface of the guide tube.

Abstract: In a throttle device, a body portion has a flat surface at a position at a predetermined distance from its center axis. Thus, when a needle member is moving, a working pressure of a refrigerant present between an inner peripheral surface of a guide tube and the flat surface acts in a radial direction of the body portion and presses part of an outer peripheral surface of the body portion located opposite from the flat surface against the inner peripheral surface of the guide tube.

Abstract: In a throttle device depressurizing and sending a refrigerant condensed by the condenser to the evaporator, hunting of a needle valve is prevented and hysteresis in differential pressure-flow rate characteristics in a high-pressure region is reduced. A valve seat member, in which a valve port is formed, and a cylindrical guide member, which is integral with the valve seat member, are provided in a cylindrical main body case configuring a primary chamber connected to the condenser and a secondary chamber connected to the evaporator. The needle valve and a coil spring energizing toward the valve port are provided in the guide member. A blade member is provided on a boss portion of the needle valve. A blade of the blade member abuts on a cylindrical guide surface of the guide member to apply sliding resistance.