Patent ID: 6390442
Filing Date: 2002-05-21
Classification: F16K

Abstract:
A two-port valve comprising a valve body including an input port and an output port for pressure fluid, a valve seat in a flow path connecting said ports, a valve member for opening and closing said valve seat, and a shaft for causing said valve member to carry out opening and closing operations,wherein said shaft has at a tip end portion thereof a shoulder portion, a small-diameter portion extending forward in an axial direction from a position of said shoulder portion, and a groove portion which is formed in a vicinity of a tip end portion of said small-diameter portion and into which a snap ring is mounted, said valve member has a through hole into which said small-diameter portion of said shaft is inserted and an annular stepped portion formed by increasing a diameter of a portion of said through hole, said stepped portion housing a sealant for providing sealing between said valve member and said shaft, and said valve member and an annular plate are successively fitted over said small-diameter portion of said shaft and said plate is fixed to said shaft by said snap ring mounted into said groove portion so as to mount said valve member to said shaft in a state in which said valve member is pushed against said shoulder portion.