Patent ID: 11898337
Assignee: XIAMEN R&T PLUMBING TECHNOLOGY CO., LTD.
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 7:
8. The effort-saving flap-type drain valve according to claim 1, wherein the flapper comprises a flapper body, a shell mounted at the bottom of the flapper body, and a water stop pad mounted at the bottom of the flapper body, wherein an air chamber being formed between the shell and the flapper body, the base being provided with a water stop face at the periphery of the drain port, the water stop pad being capable of sealing against the water stop face so that the flapper hermetically covers and connects to the drain port, or being capable of separating from the water stop face so that the flapper opens the drain port; and in a process of initial opening of the drain port, the first rotation pivot is formed at a position where the water stop pad and the water stop face are in contact with each other.