Propelling units used for dense phase pneumatic conveying are pressure containers manufactured and tested according to PED. They are manufactured in mild steel or stainless steel and their useful capacity is selected based on required conveying rate.

With a truncated-conical shape, they are equipped with a main inlet, a venting, predispositions for level indicators and a safety valve, besides an upper grabrail and tangential inlets on the conical bottom for the installation of fluidising nozzles.

Most suitable loading valve, a butterfly or dome or conical valve is selected also based on the product to be conveyed and/or required conveying rate.