Patent ID: 7712484

Claim:
A paint selector valve for switching a supply state of a paint to be supplied to a fluid passage, said paint selector valve comprising: a valve body which is connected to said fluid passage and which has a port for supplying said paint thereto; a piston which is provided displaceably in an axial direction in said valve body under an action of a pressure fluid supplied to said valve body; a shaft which is supported in said axial direction by said valve body and which is connected to said piston; a valve seat section which is formed on said valve body and which makes communication with said fluid passage; and a valve plug which is connected to an end of said shaft and which has a truncated spherical seating section formed in the shape of a truncated sphere for being seated on said valve seat section, wherein said valve seat section has a side surface opposed to said truncated spherical seating section of said valve plug, said side surface being recessed with a substantially spherical seating surface corresponding to a spherical surface portion of said truncated spherical seating section, wherein said truncated spherical seating section is formed with a planar end surface which is opposed to said fluid passage with said valve seat section interposing therebetweeen and which is substantially perpendicular to an axis of said valve plug, wherein said planar end surface of said truncated spherical seating section is substantially parallel to said fluid passage when said valve plug is seated on said valve seat section and said planar end surface is substantially flush with a wall surface of said fluid passage, no part of said valve plug entering into said fluid passage in both seated and unseated conditions of said valve plug, and wherein installation grooves, to which a pair of seal members for surrounding said port are installed, are formed on an outer circumferential surface of said valve body, and each of said installation grooves has one wall section which is smaller in height than an opposing wall section, whereby said one wall section is open and is opposed to said port, thereby exposing said pair of seal members to the interior of said port.