Abstract: A flow path unit includes a first flange including a part of a flow path, and a second flange detachably coupled to the first flange and including a part of the flow path, wherein the first flange includes a facing surface that faces the second flange when the second flange is coupled to the first flange, the facing surface is provided with an O-ring annularly surrounding the flow path, a contact surface being in contact with the O-ring annularly surrounding the flow path, and a liquid gasket disposed on the contact surface, and the contact surface is provided with at least one recessed portion.

Abstract: An exhaust recirculation valve includes: a valve housing including an exhaust gas path; a valve element provided to the exhaust gas path and configured to open and close the exhaust gas path; and a stem connected to the valve element and movable in an axial direction, in which the valve housing includes: an inlet from which fluid is supplied from the outside; a recess configured to flow the fluid flowed from the inlet toward the stem; and a throttle in a form of an opening extending from the inlet and oriented toward the stem.

Abstract: An exhaust recirculation valve includes: a valve housing including an exhaust gas path; a valve element provided to the exhaust gas path and configured to open and close the exhaust gas path; and a stem connected to the valve element and movable in an axial direction, in which the valve housing includes: an inlet from which fluid is supplied from the outside; a recess configured to flow the fluid flowed from the inlet toward the stem; and a throttle in a form of an opening extending from the inlet and oriented toward the stem.