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Empty and load brake system with separate proportional valve and load sensor valve means

  • US 4,417,767 A
  • Filed: 06/24/1982
  • Issued: 11/29/1983
  • Est. Priority Date: 06/24/1982
  • Status: Expired due to Fees
First Claim
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1. In an empty and load device of a railroad vehicle air brake system of the type having an air pressure source, a control valve connected to said source, a proportional valve connected to said control valve, a brake cylinder connected to said source through said control valve and proportional valve, and a load sensor valve connected to the line between the proportional valve and brake cylinder with a feedback line from the load sensor valve to the proportional valve for controlling the application of air through said proportional valve to said air cylinder, said load sensor valve having:

  • a valve body having a chamber therein and an air inlet and an outlet;

    valve means for controlling air flow between the inlet and outlet;

    a piston movable within the valve chamber to control the position of the valve means;

    a load sensing arm pivotally attached to the valve body and connected to the piston; and

    a rock and roll spring disposed between the piston and the valve means for dampening movement of the piston relative to the valve means so as to prevent rough track conditions from simulating a loaded or unloaded vehicle.

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