Regarding shaft support, Yaness supplies two options for different working conditions.
Single-end supported: With inboard bearings only, the structure is simple and has fewer repair parts. But when creating high pressure, the shaft may deflect and lead to low efficiency and premature wear.
Fully supported: With an extra outboard set of bearing, both ends of the shafts are fully supported because of the design.
A fully supported shaft is ideal if you request smooth running and handle higher pressure.