Thermal expansion valve
AssigneeFujikoki Corporation
InventorsKazuto Kobayashi, Kazuhiko Watanabe
Life of this patent
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Abstract
A thermal expansion valve 100 comprises a square column shaped valve body 110, and the valve body 110 contains a first passage 120 with a bottom to which the refrigerant is introduced, a valve chamber 122 formed near the bottom of the passage, a second refrigerant passage 126 traveling toward the evaporator, and a third refrigerant passage 128 returning from the evaporator. A valve means 130 equipped within the valve chamber is fixed to the working rod 132 and operated by a power element 160. The working rod 132 comprises a small-diameter portion 135, and the valve means 130 is fixed by a welding process W1 thereto with a valve seat 200 equipped in advance. The valve seat member 200 is press fit using the working rod 132 to a hole 116 formed to the valve body.
Claims2
A thermal expansion valve comprising:
- a valve body, a first passage formed to the valve body through which high pressure refrigerant travels, a valve chamber formed within the first passage, a second passage formed to the valve body in parallel with the first passage through which refrigerant traveling toward an evaporator travels, an orifice passage to which a valve seat member is press fit for communicating the valve chamber with the second passage, a valve means positioned opposing the orifice passage, a third passage through which refrigerant being sent out of the evaporator travels, and a temperature sensing rod for sensing the temperature of the refrigerant traveling through the third passage and driving the valve means according thereto;
- characterized in that the valve seat member is mounted between the working rod and the valve means in advance before it is fixed to the orifice passage, and the opening area of the orifice passage is adjusted by the displacement of the valve means.
Dependencies are inferred from the claim text.