Patent ID: 8578969

Claim:
A non-return structure of water valve, comprising: a valve body, having a first face and a second face and forming at least one inlet and an outlet, the inlet and the outlet penetrating the first face and the second face respectively, the first face forming at least one annular protrusion around the inlet and extending away from the second face, the annular protrusion defining a receiving room enclosed thereby, the receiving room communicating with the inlet; a limiting element, disposed in the receiving room and defining a widened hole and a reduced hole enclosed thereby, a stepped portion being formed between the widened hole and the reduced hole, the limiting element further having a buckle portion; a non-return element, including a blocking portion and a fixing portion, the blocking portion being disposed in the widened hole and having an external diameter larger than an internal diameter of the reduced hole, the fixing portion axially extending from a side of the fixing portion away from the second face and being embedded in the buckle portion; wherein the blocking portion is resilient, a gap is formed between an outer circumference of the blocking portion and the stepped portion to communicate the widened hole and the reduced hole when the blocking portion is struck by exterior water, the outer circumference of the blocking portion abuts against the stepped portion to discommunicate the widened hole and the reduced hole; wherein the blocking portion is a circular resilient plate; wherein the fixing portion has a head portion and a neck portion, an end of the head portion away from the neck portion is tapered, the neck portion is located at an intermediate portion of the blocking portion; wherein the limiting element includes a hollow column, the column is disposed in the receiving room of the annular protrusion, the column has an external diameter substantially equal to an internal diameter of the annular protrusion; wherein the buckle portion includes a plurality of connecting ribs and an annular rib, the connecting ribs connect the column and the annular rib therebetween, a plurality of hollow portions are formed between the connecting ribs, a receiving hole is formed through the annular rib to receive the head portion of the fixing portion; wherein the fixing portion includes an auxiliary section extending axially from an end of the head portion away from the neck portion, the auxiliary section and the head portion are inserted through the receiving hole, thereafter the head portion is disposed at the receiving hole, and the auxiliary section is removed.