Patent ID: 7448592
Filing Date: 2008-11-11
Classification: F02M,F16K,Y10T

Abstract:
1. A poppet valve device for opening and closing a high pressure liquid passage, comprising: a valve seat member having a through-hole and a first seat face; a poppet valve body slidably inserted in said through-hole of said valve seat member and having a second seat face; an annular high-pressure space formed between said valve seat member and said poppet valve body and an annular low-pressure space formed between said valve seat member and said poppet valve body; wherein seating of said first seat face onto said second seat face separates said annular high-pressure space from said annular low-pressure space; wherein said valve seat member has a plurality of axial passages in communication with said annular high-pressure space, said plurality of axial passages having substantially the same diameter and length and being located axially symmetrically with respect to a center axis of said poppet valve device; wherein an annular seat gap is formed between said first seat face and said second seat face upon said first seat face unseating from said second seat face, said annular seat gap being formed at an outer periphery side of said poppet valve body and positioned downstream from discharge ends of said axial passages such that flow from said axial passages is directed toward said annular seat gap; wherein said valve seat member has a radial passage in communication with said annular low-pressure space; wherein said poppet valve body has a central hollow for allowing liquid to escape outside of said poppet valve body; and wherein an annular gap is formed between an outer periphery of a middle part of said poppet valve body downstream of said second seat face and an inside perimeter of an annular projection of said valve seat member downstream of said first seat face, said annular gap forming a flow passage between said annular high pressure space and said annular low pressure space, and wherein said annular projection narrows said flow passage downstream of said first seat face.