| 摘要 |
PURPOSE:To obtain a valve that can be readily adjusted and has a simple construction, by arranging a pilot chamber over a secondary pressure chamber, providing a planar temperature-sensitive element of a configuration memory alloy in the pilot chamber, and moving a piston by the action of the element to open or close a main valve port. CONSTITUTION:When a refrigerant of a low temperature enters the pilot chamber 35 from an opening 41, the temperature-sensitive element 37 is deformed by the resiliency of a spring 39 to cause a pilot valve body 40 to close a pilot hole 34 of a partition 33 of a cylinder 24. Then the refrigerant in the secondary pressure chamber P is drawn by the operation of a compressor connected to a case 21 so that the chamber P is negatively pressurized and the piston 27 is raised by a spring 28 to throttle the opening of the main valve port 26. When the temperature of the evaporator connected to the case 21 becomes a prescribed value or above, the temperature-sensitive element 37 returns to the position as shown in the figure, the pilot valve body 40 is raised to open the pilot hole 34, the refrigerant passed through the pilot hole 34 lowers the piston 27 against the spring 28 via the partition 31 of the piston 27, and a control valve port (a) of the piston is aligned with the main valve port 26 to widen the opening of the main valve port 26. |
