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Pressure relief valve

  • US 5,261,471 A
  • Filed: 03/30/1992
  • Issued: 11/16/1993
  • Est. Priority Date: 03/30/1992
  • Status: Expired due to Term
First Claim
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1. A vehicle comprising at least one valve assembly, at least one rotatably mounted wheel including a tire supported thereon and having an inflatable volume normally containing an air pressure greater than a first predetermined amount and less than a greater second predetermined amount;

  • the valve assembly including a valve housing affixed to the wheel and having a first port fluidly communicating with air pressure in the volume and having a vent port, a first valving means disposed in the housing and biased toward a closed position by a closing force of a spring means and toward an open position by an opening force of the air pressure at the first port;

    the first valving means operative in the closed and open positions respectively to prevent and allow air flow from the first port to the vent port;

    the improvement characterized by;

    the air pressure opening force exceeding the spring means closing force in response to the air pressure at the first port being greater than the first predetermined amount; and

    blocker means for preventing the opening of the first valving means in response to the air pressure at the first port being between the first and second predetermined amounts, the blocker means operative to prevent the opening of the first valving means in response to selective movement of an actuation means from a vent position to a nonvent position.

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