Main hydrant valve with replaceable valve seat

摘要

The valve (51) has an alternating valve seat (53) inserted along axial direction to move freely in a hydrant (56) where two concentric annular seals (70) abut sealingly in a final position of the valve seat on an inner surface (73) of a component (56') of the hydrant. A securing element (58) and the valve seat are formed and used from the hydrant in which components on a hydrant inlet (57) are mounted. The valve seat and the inner surface of the component have a cylindrical shape or different shape of a cylinder.