Patent ID: 7000342

Claim:
A steam iron comprising: a housing having a receiving chamber therein; a water tank mounted in said receiving chamber, said water tank having a tank body for storing water, and a water supply pipe extended from said tank body; a boiler mounted in said receiving chamber, said boiler having a boiler body connected to said water supply pipe for receiving water from said tank body and boiling water into steam, and a relief pipe having an end connected to said boiler body and an opposite end connected to said tank body; a one-way check valve for controlling one-way flowing direction of water from said tank body to said boiler body, said one-way check valve having a casing mounted in said water supply pipe, and a valve flap movable in the casing of said one-way check valve between an open position and a close position, said valve flap being moved to said open position for enabling cold water to pass from said tank body to said boiler body when an internal pressure of said boiler body is within a predetermined level, said valve flap being moved to said close position by the internal pressure of said boiler body when the internal pressure of said boiler body surpassed the predetermined level; and a relief valve having a casing mounted in said relief pipe, and a piston mounted in the casing of said relief valve and movable between an open position and a close position to control passage of said relief pipe, said piston being moved to the open position for enabling steam to pass from said boiler body to said tank body when the internal pressure of said boiler body surpassed the predetermined level, said piston being moved to the close position by water from said tank body to stop the passage of said relief pipe when the internal pressure of said boiler body is below the predetermined level.