Patent ID: 7467781

Claim:
A poppet valve device for opening and closing a high-pressure liquid passage, said poppet valve device comprising: a valve seat member; and a poppet valve body inserted in a through-hole of said valve seat member for sliding in said through-hole, wherein: said poppet valve device is configured such that positioning a seat face of said poppet valve body onto a seat face of said valve seat member separates an annular, high-pressure room from an annular, low-pressure room, said annular rooms being formed between said poppet valve body and said valve seat member; said valve seat member includes an axial passage that communicates with said high-pressure room and a radial passage that communicates with said low-pressure room; said poppet valve body includes a central hollow that extends from a lower end face of said poppet valve body to a top end of said poppet valve body and is for allowing liquid fuel leaked due to sliding between said valve seat member and said poppet valve body to escape to said top end of said poppet valve body from said lower end face of said poppet valve body; a seat gap is formed between said seat face formed on a periphery of said poppet valve body and an inside perimeter of an annular projection of said valve seat member; an annular gap is positioned lower than said seat gap in a downstream direction and is formed between said periphery of said poppet valve body in a middle part thereof and said inside perimeter of said annular projection of said valve seat member; and a radial width of said annular gap is narrowed to restrict liquid fuel flow from said high-pressure room to said low-pressure room so that the occurrence of cavitation erosion is suppressed.