| 摘要 |
A valve body of a thermal type expansion valve comprises of a fist path 32 and a second path 34 as the valve body 30, and a rod member 316 forming a heat sensing shaft 36f is a shaft having a small diameter, and according to the displacement of the diaphragm 361 of the power element member 36, the shaft is driven back and forth crossing the path 34. The rod member 316 has an overall length whose ratio is 17 to 28 against the outer diameter size, and is formed not to buckle against the stress added in the axial direction, which contributes to the miniaturization and lighter weight of the valve as a whole.
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