Circuit arrangements for an electrical ventilation reversing valve

摘要

In order to solve heating problems, known circuits switch the float chamber ventilation, for example as a function of the fuel feed pressure or of internal and external ventilation. These designs are unsatisfactory, however, since they do not solve the heat problem occurring whilst the engine is in operation The new circuit arrangement is characterised in that, in the event of higher temperatures in the float chamber area, it switches to external ventilation for a certain period of time. Circuit arrangements of the said type have applications in motor vehicle construction. <IMAGE>