(19)
(11) EP 2 503 267 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
12.03.2014 Bulletin 2014/11

(43) Date of publication A2:
26.09.2012 Bulletin 2012/39

(21) Application number: 12150529.1

(22) Date of filing: 10.01.2012
(51) International Patent Classification (IPC): 
F25B 41/06(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME

(30) Priority: 22.03.2011 JP 2011063003

(71) Applicant: Fujikoki Corporation
Tokyo 158-0082 (JP)

(72) Inventors:
  • Kobayashi, Kazuto
    Setagaya-ku, Tokyo 158-0082 (JP)
  • Mogi, Takashi
    Setagaya-ku, Tokyo 158-0082 (JP)

(74) Representative: Schweiger, Martin 
Schweiger & Partner Anwaltskanzlei Karlstrasse 35
80333 München
80333 München (DE)

   


(54) Expansion valve


(57) An expansion valve has a valve main body 10, a valve member 40, and a power element 100. The power element 100 includes a diaphragm 130 sandwiched between an upper cover member 110, and a receiving member 120. Outer peripheries of the upper cover member 110, the diaphragm 130, and the receiving member 120 are joined by laser welding. The distance from a fulcrum position of the diaphragm 130 to an outer periphery of the power element 100 is set to be a distance obtained by adding 0.2 mm to 1.0 mm to the length dimension of the welding part formed by laser welding. The assembled power element 100 is inserted into a cylindrical part 12 provided at an upper part of a valve main body 10, and is fixed by a caulking part 12a formed by caulking-processing, thereby to reduce the size of the power element 100.










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