Patent ID: 8402991

Claim:
An outlet valve for a frost-preventing faucet comprising a tubular receiving valve seat with an open lower end and a columnar water controlling plug whose bottom end includes a protrudent portion; said columnar water controlling plug being embedded into two sides of a top face of a butterfly-shaped top porcelain disc disposed under said plug, thereby allowing a turning adjustment of aiming an outlet gate of said top porcelain disc at an outlet gate of a bottom porcelain disc; a top end of said columnar water controlling plug being disposed within an axial hole at a central top of said receiving valve seat; a central bottom of said water controlling plug defining an inlet passage extended from downward toward upward into a middle section of said plug; an outlet passage being laterally communicated at two sides of said inlet passage; wherein, an axial slot is defined at a central top inside said inlet passage; said axial slot receiving an insertion of an elastic element and an axial post disposed at one end of a stop valve for allowing an axial and restrictive motion; a first stop ring being disposed around said stop valve; said stop valve being inserted into a limiting slot of a hollow stop sleeve disposed under said stop valve to control water flow; a second stop ring being disposed around said stop sleeve and inserted into a lower section of an inner wall of said inlet passage; a bottom of said second stop ring being disposed above a top of said top porcelain disc; cooperating said outlet valve with a porcelain valve unit with said top porcelain disc allows feeding water upward when said outlet gates of said bottom porcelain disc and said top porcelain disc stay abreast without blocking; when a water pressure is larger than a rebounding force of said elastic element, said stop valve upwardly compresses said elastic element, leading to said water traveling through said inlet passage disposed at said middle section of said plug, passing through said outlet passage that is laterally communicated, entering into an outlet hole at a top end of said tubular receiving valve seat, and thence upwardly going into a supplying pipe of said faucet; when said water pressure is smaller than said rebounding force of said elastic element, said elastic element compresses said stop valve to make said stop valve downwardly inserted into said limiting slot of said stop sleeve for impeding water flow, so that said porcelain valve unit is prevented from freezing, and said water pressure is capable of controlling a feeding of said water flow.