US Patent 11866920 Flush valve assembly

A flush valve assembly comprising a flush valve comprising a flush valve body extending from a flush valve inlet to a flush valve outlet; a flush valve seal having a top face and a bottom face; and a flush actuator comprising a rigid linkage; wherein the bottom face of the flush valve seal is configured to enclose the flush valve inlet; and wherein the rigid linkage is coupled to the top face of the flush valve seal and is configured to lift the flush valve seal to open the flush valve and to lower the flush valve seal to close the flush valve. A rigid linkage is configured to lift a flush valve seal and to lower a flush valve seal at a controlled rate.