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Variable load valve

  • US 4,786,117 A
  • Filed: 07/09/1987
  • Issued: 11/22/1988
  • Est. Priority Date: 07/09/1987
  • Status: Expired due to Term
First Claim
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1. A vehicle brake control system comprising:

  • (a) braking means;

    (b) a brake pipe normally charged to a certain chosen pressure;

    (c) an auxiliary reservoir;

    (d) control valve means for establishing fluid pressure communication between said brake pipe and said auxiliary reservoir to effect charging of said auxiliary reservoir to the pressure of said brake pipe during a brake release and thereby provide a first source of supply fluid under pressure;

    (e) a first fluid pressure supply path between said control valve means and said auxiliary reservoir;

    (f) a fluid pressure delivery path between said control valve means and said braking means;

    (g) a supplemental volume reservoir in said first fluid pressure supply path charged to the pressure of said auxiliary reservoir to provide a second source of fluid under pressure, said control valve means being operative during brake application to establish fluid pressure communication of said auxiliary and supplemental volume reservoirs with said braking means via said first supply path and said delivery path, whereby an unmodulated buildup of brake pressure is realized at said braking means in accordance with the combined supply of said first and second sources of fluid under pressure thereto; and

    (h) variable load valve means for interrupting said first supply path upstream of said supplemental volume reservoir to isolate said auxiliary reservoir from said braking means, whereby a modulated buildup of brake pressure is realized at said braking means is accordance with the supply of said second source of fluid pressure thereto in the absence of said supply of said first source of fluid pressure.

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