A solenoid spool valve includes a spool valve, a spring, and an electromagnetic actuator. An underside of the nozzle base includes a main suction opening formed therein which is in fluid communication with the upper housing via a hose assembly. The model radiative-heating oven also may have a quickly openable and closable object carrier, which facilitates a timely start and end of a desired heat treatment process. Structures for providing reinforcement are arranged in the edge region andor in the center of the elastic element. Other methods and apparatuses are also described.