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US 4,841,579 AGranted
Flush valve with snap-on flapper
OwnerBruce A. Antunezinventor
Life of this patent
Estimating the term…
Abstract
A rigid flapper type valve having a backing plate has been provided with a valve seal in the form of a flexible disc mounted to the bottom of the flapper valve. During sealing the disc will flex to contact the backing plate. A vent hole is provided in the backing plate to vent the area between the disc and plate.
Claims3
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.
Dependencies are inferred from the claim text.