Inflow and outflow ventilation system, with spherical nipple valves and cover

摘要

The ventilation system includes nipple valves of co-axial design, consisting of a base body with through axial channels and a displacement trap valve held by a spring (10) to prevent air moving through the lower conical part (9). These valves are fitted in the surface of the cover, which is divided by a partition wall into air input and output sections.