Thermal expansion valve

Details Thermal expansion valve Thermal expansion valve

1997-08-29

1999-08-31

Tapolcai, William E.

Refrigeration

Automatic control

Refrigeration producer

236 92B, F25B 4104

Patent

active

059438711

ABSTRACT:
An expansion valve includes a temperature sensing rod made of metal, for sensing a temperature of refrigerant in an evaporator outlet side passage. A first pressure chamber and a second pressure chamber are separated by a diaphragm. The temperature sensing rod include a small-diameter shaft portion and a diaphragm stopper portion which is connected to an end of the small-diameter shaft portion and contacts the diaphragm. The evaporator outlet side passage and the second pressure chamber are communicated through a space. A heat transmission delay member made of resin is press-fitted to the temperature sensing rod, and includes a thin cylindrical portion which covers a part of the small-diameter shaft portion, placed in the evaporator outlet side passage, a thick cylindrical portion which covers a part of the small-diameter portion, placed in the space and the thick circular plate which covers the diaphragm stopper portion.

REFERENCES:
patent: 3667247 (1972-06-01), Proctor
patent: 3822563 (1974-07-01), Orth
patent: 4542852 (1985-09-01), Orth et al.
patent: 5303864 (1994-04-01), Hirota
patent: 5361597 (1994-11-01), Hazime et al.

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