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Flap valve

  • US 4,019,532 A
  • Filed: 05/28/1975
  • Issued: 04/26/1977
  • Est. Priority Date: 06/07/1974
  • Status: Expired due to Term
First Claim
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1. A flap valve and in particular a return flap valve comprising:

  • a flat disk-like valve housing having inlet and outlet openings along its longitudinal axis defining a flowthrough channel;

    a valve seat formed in said housing and surrounding said outlet opening;

    a valve disk disposed on said valve seat for closing and sealing the output opening, said disk having pivot axis means projecting toward the input opening and offset from the valve axis;

    a first control lever having its ends pivotably coupled to diametrically opposite portions of said housing in the inlet opening and its center portion pivotably coupled to said pivot axis means; and

    a second control lever having one end pivotably coupled to said pivot axis means, and its opposite end pivotably coupled to said housing in close proximity with respect to a wall of said flowthrough channel at the inlet opening, the pivot axes of both control levers being arranged parallel to each other so that when said valve disk is closed on said valve seat, both control levers be in the same plane which is perpendicular to the valve axis, and when said valve disk is opened, said first control lever displaced said disk apart from said valve seat and said second control lever maintains the disk in a non-perpendicular position with respect to valve axis.

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