The present invention relates to a valve which includes a housing made from aluminum and a valve seat made from aluminum, for a flap which is mounted such as to rotate on a drive shaft and a peripheral piston seal. The secondary solar receiver generates steam using energy from solar radiation incident thereon. The planarization film has an opening where an edge portion is rounded. The thawing line is connected to the heating element, adapted to spread thermal energy from the heating element throughout the undercarriage of the machine, and is isolated from the engine. Updating can be provided with reference to table values or the values can be provided from combination logic.