Pressure reduction and regulation groups allow to bring gas pressure available in the line to values suited to the specific application.Gas trains include a series of safety and control devices for gas feeding to the burner.They are constructed and supplied with two different selection options (separated or assembled units). The selection has to be made on various considerations about the specific application (available pressure, installation chances,...).This permits to reach the best flexibilty in the application using pre-assembled units, which are also tested in the factory in the respect of existing normatives and projected for a simple installation procedure.