The model represents a conic valve inserted into a cylindrical duct visible in section. In correspondance with the valve casing the duct widens. The valve is mounted on an iron rod, actuated by a pump, the valve opens lifting and allowing water to pass from below to above, but not in the opposite direction.
The model is based on the drawing:
- Manuscript E ff. 33 v., 76 r. (1497-1502)
Paris, Institut de France