Valve housing and method for manufacturing a valve housing

A method for producing a valve housing for a fluid valve, which has at least one fluid channel through which a fluid can flow and a receiving space for a valve closing body movable in the valve housing, the method comprising:

• providing an injection mold;
• providing at least a first and second core, the cores being configured to form portions of at least one fluid channel in the valve housing;
• providing a collapsing core for forming the receiving space, the collapsing core having at least one recess for producing at least one valve seat in the receiving space;
• introducing the first and second core and the collapsing core into the injection mold, at least the first core interacting with the collapsing core such that the free end of the first core is oriented towards the recess of the collapsing core;
• introducing a flowable molding material into the injection mold;
• removing the first and second core and the collapsing core from the injection mold,
• wherein the valve housing produced by the injection molding process has at least one valve seat projecting into the receiving space forming at least one undercut in the receiving space;
• wherein the at least one valve seat includes an annular elevation formed by the collapsing core, the annular elevation forming a planar abutment surface configured to interface with a sealing diaphragm partially surrounding the valve closing body, and wherein an annular sealing edge is formed by the collapsing core at the annular elevation and projects axially into the receiving space.