Patent ID: 7421889

Claim:
A tire pressure warning assembly comprising: a tire valve, connected to a tire; a switch, received in the tire valve and having a conductive member, a movable member and a biasing member, wherein the movable member is located at a distance from the conductive member, a first end of the movable member being exposed to the air in the valve and a second end of the movable member being in contact with the biasing member which exerts a force to the movable member, and a cover, connected to the tire valve and having a casing which has a battery set received therein, the battery set having one pole connected with the movable member and the other pole of the battery set being in contact with a warning device, the warning device electrically connected with the conductive member, and the biasing member pushing the movable member to be in contact with the conductive member to form a circuit when pressure of the tire is less than the pre-set value of the biasing member so as to activate the warning device, wherein the tire valve includes a tube and a base which is connected to an end of the tube, and the base has a passage in which the movable member and the biasing member are received, wherein a core piece is located in the tube and includes a positioning portion, a slidable piece which is slidable relative to the positioning portion, and a one-direction valve which is connected to the slidable piece, and a ring is connected to the core piece and a cap is located beneath the ring and presses on a periphery of the conductive member.