Patents Represented by Law Firm GJF
  • Fluid pressure control valve device for a railway car
    Patent number: 5146952
    Abstract: A control valve device for a railway car having an arrangement for changing the axial position of a variable area piston in order to adjust the output pressure of a piston valve assembly in accordance with a high or low speed of the railway car. The axial position of a supply valve seat is set in accordance with a high or low speed signal to in turn set the axial posiiton at which the piston assembly, including the variable area piston, assumes a lap condition.
    Type: Grant
    Filed: September 24, 1991
    Date of Patent: September 15, 1992
    Assignee: Nippon Air Brake Co., Ltd.
    Inventor: Hideo Tamamori