Flush valve with snap-on flapper

  • US 4,841,579 A
  • Filed: 11/20/1987
  • Issued: 06/27/1989
  • Est. Priority Date: 11/20/1987
  • Status: Expired due to Term
First Claim
Patent Images

1. A seal assembly for a valve flapper, said assembly comprising:

  • a rigid backing disc having a flat backing face and a central post extending from it; and

    a resilient deformable seal shaped as a flat disc mounted to said post in circumferential sealing contact with said post, said seal having a flat face spaced from the backing face of said backing disc near the post, said backing disc having a vent port therethrough near said central post and opening through said face into the space between the respective faces wherein, with said valve resting on a valve seat said deformable disc will contact said flat backing face along the periphery of said disc and backing face to create a space which is vented by said opening.

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