Patent ID: 7610817

Claim:
An orifice member comprising: a tube portion whose ends are each connected to an object and whose inner section forms a channel connecting the objects; and an orifice provided inside the tube portion, wherein the tube portion and the orifice are integrated, wherein, on at least one of the ends of the tube portion, a nut through which the end of the tube portion is passed and a sleeve inserted into the end of the tube portion and forming a large-diameter portion by widening the section near the end of the tube portion outwards in the radial direction are provided, and wherein, on the inner circumferential surface of the nut, a female, threaded portion and an engagement protrusion are provided, the engagement protrusion engaging with the large-diameter portion and protruding from the center area in the longitudinal direction of the tube portion, farther inward in the radial direction than the female threaded portion.