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Hydraulic or pneumatic pressure control device and its application in devices regulating the pressure of tires of vehicles in motion

  • US 4,782,879 A
  • Filed: 04/14/1987
  • Issued: 11/08/1988
  • Est. Priority Date: 10/04/1985
  • Status: Expired due to Fees
First Claim
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1. A device for controlling hydraulic or pneumatic pressure adapted to be interposed between a source of pressure, a utilization chamber and an escape, so as to ensure a feeding of fluid under pressure to said chamber or reservoir, and a discharge of the fluid under pressure from said reservoir to the escape, said device comprising a single body including a first orifice arranged to be connected to the source of pressure, a second orifice arranged to be connected to the utilization reservoir, a third, escape orifice, means responsive to a first control pressure, of low value, for connecting the utilization reservoir to the escape orifice, means responsive to a second pressure, of high value, for putting said second orifice in communication with the source of pressure and for preventing communication between said second orifice and the escape orifice, and a short passage of relatively large cross section, unconnected to said first orifice, directly connecting said escape orifice and said second orifice together.

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