Patent ID: 7938452

Claim:
A fluid device and a fitting connected to a side face of said fluid device, wherein: the side face of said fluid device has a recess formed therein, said recess having an internal thread and extending from said side face to an annular end face surrounding a fluid supply/discharge passage in said a fluid device, said fluid supply/discharge passage and a fluid passage formed in said fitting are communicatingly connected to each other, a functional component, which allows a fluid flowing between said fluid device and said fitting to pass through said functional component and which exerts an action on the fluid, is interposed between said fluid device and said fitting in a state where said functional component is sealed both by said fluid device and said fitting, and an annular groove in said annular end face and an annular projection formed on and projecting from said fitting are fitted to each other to constitute a sealing portion in a state where said fluid device and said fitting are fittingly coupled to each other, an integral body portion of said fluid device presents radially spaced inner and outer side walls defining said annular groove, an external thread is formed on the fitting and is engaged by the internal thread in the recess of said fluid device in the state where said fluid device and said fitting are fittingly coupled to each other, and said fitting has a gear-shaped outer surface portion providing engagement recesses which receive and hold heads of bolts screwed into said side face of said fluid device.