Process valves without atmospheric valve for reliable control of the gas and air supply, e.g. for Kromschroeder gas burners with low / low operation and gas-consuming appliances, when controlling the flame of several Kromschroeder burners. The modular design of the intermediate element allows individual combinations with all MODULINE components. This makes it possible to modulate compact reinforcement lines. Due to the choice of different flanges for each valve size, it can be used on any pipeline.