| 摘要 |
PURPOSE:To enable proportional control of an opening according to a temperature change, by a method wherein a valve body forms a metering valve, and the mounting length of a spring, by means of which a valve body is energized to a valve closing position, is adjustable by means of an adjust screw. CONSTITUTION:A valve body 17 forms a metering valve equipped with a taper part 17b, according to displacement of which the passage area of a communicating passage is adjusted. The tip part of an adjust screw 19 is engaged with the central recessed part of a first retainer 15, and a second spring 18 is stretched between the valve body 17 and the first retainer 15. The valve body 17 is energized in a closing direction, a second retainer 22 is brought into contact with the other end of the valve body 17, a third spring 23 made of a shape memory alloy is stretched between the second retainer 22 and a case 20, and the valve body 17 is energized in an opening direction. This constitution enables proportional control of an opening by means of temperature-displacement characteristics of the third spring 23 made of a shape memory alloy.
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