Patents by Inventor Christian Valadon

Christian Valadon has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5692557
    Abstract: A heat exchanger, in particular for a nuclear reactor steam generator, comprising a U-tube bundle and a stabilizing system composed of anti-vibration bars inserted between the tubes of the bundle in the upper tube U-bend region. The anti-vibration bars have portions that protrude from the tube bend region, and the stabilizing system comprises elements which connect the aligned portions of the ends of the anti-vibration bars and are composed of a comb with slots designed to receive the ends of the anti-vibration bars, and a comb cover attached with fastening means. All the connecting elements are attached to supports that are joined to the bundle wrapper, while allowing limited movement of the set of anti-vibration bars and connecting elements.
    Type: Grant
    Filed: March 5, 1996
    Date of Patent: December 2, 1997
    Assignee: Framatome
    Inventors: Nicolas Gillet, Christian Valadon, Jean-Pierre Roinjard, Joseph Chabrerie, Sok Kang
  • Patent number: 5529020
    Abstract: Tube lane blocking is accomplished by a plurality of removable blocks which can be fitted and extracted from the central region, in the inner casing of the steam generator. The blocks are superposed in a stack resting on the tube plate, and are immobilized at their ends by a holding fixture. An anti-liftoff blocking member at opposite ends of the blocks prevents them from being lifted off the tube plate. When maintenance or repair of the tube plate is required, the holding fixture and anti-liftoff blocking member can be withdrawn in order to permit access to the tube plate and the adjacent tube bundle.
    Type: Grant
    Filed: October 11, 1994
    Date of Patent: June 25, 1996
    Assignee: Framatome
    Inventor: Christian Valadon
  • Patent number: 5515911
    Abstract: An element (18) of elongate form is fastened onto the tube support plate (8a) of the steam generator nearest the bent parts (10c, 10"c, 10'"c) of the tubes (10) of the bundle, in a central free zone of the bundle, in line with the small bends (10"c) of the tubes of the bundle. Anti-vibration bars (15) of a set of bars which are intended to be placed between any two adjacent rows (20) of the bundle of tubes are fastened by their internal end onto a dovetail piece (16) which is attached to the elongate element (18). All the anti-vibration bars (15) intended to come into a space contained between two successive rows (20) of the bundle of the heat exchanger are thus fitted in a single operation. The invention applies in particular to steam generators of pressurized water nuclear reactors.
    Type: Grant
    Filed: July 11, 1994
    Date of Patent: May 14, 1996
    Assignee: Framatome
    Inventors: Gerard Boula, Christian Valadon
  • Patent number: 5514250
    Abstract: The blocking device includes sets of antivibration bars (25, 25') interposed between layers of tubes (24) of the bundle of the steam generator, in the upper part of the bundle, termed the tube bend region. The antivibration bars (25, 25') include parts (25b, 25'b) which project with respect to the tube bend region, and the blocking device includes a linkage of the end parts of the antivibration bars, which include aligned openings. The linkage includes a screw (21) whose head (21a) bears on a first antivibration bar (25) and whose threaded rod (21b) is screwed into a spacer (22). The spacer (22) is fixed either in a second spacer or in a tapped fastening element (23), by a threaded part (22b). The threaded parts (21b) of the screw and (22b) of the spacer pass through the antivibration bars (25, 25') through aligned openings.
    Type: Grant
    Filed: October 18, 1994
    Date of Patent: May 7, 1996
    Assignee: Framatome
    Inventors: Gerard Boula, Christian Valadon
  • Patent number: 5492169
    Abstract: A steam generator for a nuclear power station in which the flow of secondary fluid is deflected and distributed by a block articulated on a fixed horizontal pivoting spindle, such as to retain maintenance access to the tube place by tooling introduced through orifices in the outer casing, and to eliminate dead zones difficult to access for cleaning and servicing the tubes.
    Type: Grant
    Filed: October 11, 1994
    Date of Patent: February 20, 1996
    Assignee: Framatome
    Inventor: Christian Valadon
  • Patent number: 5335631
    Abstract: In a steam generator equipping a nuclear power station and having inverted U-Lubes connected to a tube plate or sheet (12) and surrounded by an inner envelope (26) having a lower flow distribution plate (41) in its bottom part, the space (46) known as a waterway between the tube plate (12), the flow distribution plate (41) and the hot and cold branches of the tubes contains a deflection and purging box (44). The latter extends over the entire length of the waterway and in height up to the upper edge of the lower envelope (26). It is provided on its lower face with purging orifices (50) and fulfils both a deflection function and a secondary fluid drainage function in the vicinity of the tube plate (12).
    Type: Grant
    Filed: April 15, 1993
    Date of Patent: August 9, 1994
    Assignee: FRAMATOME
    Inventors: Thierry Daffos, Christian Valadon
  • Patent number: 5269371
    Abstract: In a heat exchanger, such as a steam generator equipping a nuclear power station, the intermediate inwardly curved parts (14c) of the U-tubes (14) grouped into a bundle forming parallel layers are maintained by antivibration bars (36a, 36b', 36c') placed between each pair of adjacent layers, these bars being interconnected outside the bundle by connecting pins (38a, 38b, 38c). To prevent the fly-off of the assembly formed by the antivibration bars and the connecting pins, at least part of the bars (36a, 36b', 36c') are placed in slots formed in an elongated structure (40) fixed to the spacing plate (34a) closest to the inwardly curved part of the tubes.
    Type: Grant
    Filed: November 25, 1992
    Date of Patent: December 14, 1993
    Assignee: Framatome
    Inventors: Gerard Boula, Jean-Pierre Roinjard, Christian Valadon