| 摘要 |
PROBLEM TO BE SOLVED: To improve durability of a diaphragm without requiring addition of a part to a power element or machining in a thermal expansion valve. SOLUTION: A shape of an upper housing 21 constituting a temperature sensing chamber is formed to be a stopper part 30 approaching to a diaphragm position when a valve part 2 is fully closed, and an over stroke amount of the diaphragm 23 is regulated. A position of a center pressure receiving part 29 of the diaphragm 23 when the valve part 2 is fully closed is set to be near a plane including a welded part of an outer periphery of the diaphragm 23, and a corrugated part 28 of the diaphragm 23 is prevented from inducing reverse operation at the time of opening and closing operation of the valve part 2. COPYRIGHT: (C)2007,JPO&INPIT
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