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Pressure sensor which prevents leakage of fuel

  • US 5,621,176 A
  • Filed: 08/05/1996
  • Issued: 04/15/1997
  • Est. Priority Date: 03/30/1995
  • Status: Expired due to Fees
First Claim
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1. A pressure sensor into which the internal pressure of a fuel tank is introduced, comprising:

  • a nipple portion for introducing a fuel tank pressure;

    an air introducing hole for introducing air into an atmospheric pressure portion;

    a pressure buffer chamber disposed in said nipple portion; and

    a check valve provided in the buffer chamber,wherein said check valve is suspended in said buffer chamber in order to allow a fuel to pass through said nipple portion to said atmospheric pressure portion when said fuel tank is upright during a normal operation,wherein said check valve blocks said fuel from passing from said nipple portion to said atmospheric pressure portion when said fuel tank is turned sideways or is turned over, in order to prevent a leakage of said fuel during an overturning of a vehicle carrying said fuel tank.

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