Abstract: Pre-controlled valve, in particular an electropneumatic regulating valve for an air brake system of a motor vehicle, comprising a valve housing (1), which contains an axially adjustable control piston (5) and which can be actuated by means of at least one electromagnetic pilot valve (6) for axial adjustment, and which is provided to actuate a valve seat assembly (9), which switches the compressed air flow between at least one external brake line connection (15), a feed pressure connection, as well as a venting port (17), and which comprises in essence a pot-like sealing cup (12) with a coaxial passage (23), the circular ring-shaped sealing area (13) of which corresponds with a coaxial valve seat assembly, constructed out of an external valve seat (11) and an internal valve seat (10), whereby the sealing cup (12) exhibits an internal reinforcing insert (24), which is formed essentially in the shape of a U according to the cross section of the edge and which is provided with a molded-on shoulder (25), which is