Valve for metered admixing of volatilized fuel to the fuel/air mixture of an internal combustion engine

A valve for the metered admixing of fuel, which has volatilized from a fuel tank of an internal combustion engine, to a fuel/air mixture which is fed to the internal combustion engine via an induction manifold, a valve housing which has an inflow socket for a first connection to a vent socket of the fuel tank or to an activated carbon reservoir which is connected downstream from the fuel tank, for the volatilized fuel, an outflow socket for a second connection to an induction manifold, a seat valve, which is arranged inside the valve housing between said inflow and outflow sockets, a valve double seat surrounding an annular valve opening, an annular valve member which acts in conjunction with said valve double seat, said annular valve member being loaded by a valve closing spring in the direction of valve closing, and operable by an electromagnet in the direction of the valve opening, this electromagnet having a pot shaped magnet housing which is arranged coaxially relative to the valve opening, a hollow cylindrical magnet core arranged centrally in the magnet housing, a field coil which lies in the annular space between the magnet core and the magnet housing, a return yoke covering the magnet housing, and an armature which forms the valve member and which is of magnetically conductive material, the valve opening is arranged as a ring gap nozzle (34) in the return yoke (27) and that the valve double seat (32) is designed on the side of the return yoke (27) which faces the inflow socket (11), and that the hollow cylindrical magnet core (15) can be screwed into an adjusting thread (19, 20) provided in the base of the magnet housing (14) and carries a shoulder (50) for the valve closing spring (49) which is supported against the armature (37).