Check valve and receptacle structure

Abstract

In order to reduce a pressure loss in a check valve and simplify a manufacturing process, a check valve () configured to be disposed in piping of fluid is provided, which includes a valve housing () including a valve element () and a valve seat () therein, a casing () that is configured to place the valve housing therein, in which a casing flow path () is provided between the casing and the valve housing to make a flow of the fluid in an axial direction of the valve housing. In the valve housing, a communicating hole () and sealing portion () are formed. The communicating hole that is formed through the valve housing in a thickness direction thereof introduces the fluid, which flows through between the valve element and the valve seat at the open position of the check valve, into the casing flow path. The sealing portion that is provided on an outer surface of the valve housing upstream of the communicating hole in a flow direction of the fluid in the casing flow path, is configured to come into contact with an inner surface of the casing to seal the casing flow path and position the valve housing in a radial direction perpendicular to the axial direction relative to the casing.