The internal rotor consists of a number of vanes or blades, mounted on a rotating shaft, made of different materials and with various construction solutions depending on the application. For example, rotors can have opened or closed extremities: in the first case all the blades will be welded only to the shaft, in the second case to the shaft and two discs at the ends. Closed rotors are more suitable in high working pressure systems, more abrasive materials and when air leakage must be kept to a minimum.
The section of the rotor shaft with attached blades also has different conformations for different industrial needs. Generally speaking, this section can be seen as a number of contiguous chambers in the shape of a V letter, each one with a joint apex on the shaft. For very compact materials, however, U-shaped chambers are more suitable, so that the material is discharged more easily and does not stick to the shaft.
Finally, we also have in our catalogue rotary valves with adjustable blade ends (bibs) and made of specific materials, which can provide greater elasticity, greater flexibility, great resistance to abrasion or be spark-proof.