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Vacuum check valve

  • US 4,951,708 A
  • Filed: 11/30/1988
  • Issued: 08/28/1990
  • Est. Priority Date: 11/30/1988
  • Status: Expired due to Term
First Claim
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1. In a vacuum check valve assembly for a vacuum powered brake booster having:

  • a housing having a valve chamber formed therein, an inlet opening adapted to be connected to a vacuum powered brake booster, an outlet opening adapted to be connected to a source of vacuum pressure;

    a check valve in said valve chamber having a normal closed position preventing vacuum communication between said outlet and said inlet and an open position permitting vacuum communication between said outlet and said inlet;

    said check valve having an axially guided center disc including a disc body having a center and an annular rubberlike valve portion on the outer peripheral part of said disc body which sealingly engages said housing when said valve is in the normal closed position and is spaced from said housing to permit air to flow therepast when said valve is in the open position;

    the improvement comprising;

    said check valve center disc having a flexible portion of said disc body radially intermediate the area of sealing engagement of said center disc annular rubberlike valve portion with said housing and said center of said disc body, said flexible portion being formed by an annular less thick portion of said disc body than the part of said disc body radially inward of said flexible portion, said flexible portion acting when said valve is in said normal closed position to permit slight axial movements of said disc body in response to pressure pulsations generated by said source of vacuum pressure without unsealing said rubberlike valve portion from said housing.

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