Compared to the previous version: the unloading has been revisited both in geometries, reproduced and varied dimensions, and in the fault, granted at the time of aspiration; The aspiration labor are perfectly symmetrical in the entrance to the cylinder and the flow path has a completely different orientation of fresh gases at the entrance to the room. The big novelty are the rear labor, which, subjected to a reinterpretation of the "nail" rear technique, now present adequate inclination and, above all, a calculated progression of areas of crossing the flows. The union of the two rear ducts in the characteristic "h" shape allows you to make the most of the pumping work, transferring the greatest possible energy with the smaller losses to the flows. These innovations translate into a greater.
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