Thank you for your visit and question.
The three air caps are designed to function on the LPH400LV. They all have engineered atomization, each cap designed to produce a specific partical size.
The LVC aka LV4 is best for general purpose and is especially good for clear.
The LVB is a specialty cap designed to spray the most difficult colors that contain special affect toners, lenticular, silver dollar and the like metallics and micas. The LVB also requires some special settings and spray techniques. An LVB Operating manual comes with each LVB cap or gun.
Follow the instructions in the OM for gun set up and spray technique and you'll be very happy with the results.
The LVX is great for spraying 95+% of metallics and micas. It has great engineered atomization, a wide wet line spray pattern that makes it very easy to use and very forgiving. Although the LVX was designed for metallic/micas there is a growing number of technicians that are using it for clear on Mercedes, BMW and others. The object is to return the auto to the pre-collision condition and the LVX lays out the clear that matches the original finish. That means no rub time.
All three air cap spray non Metallics just fine.
All suggested fluid nozzle / air cap combinations, inlet air pressure and spray techniques are a starting point reference only and not meant to imply other combinations and techniques would not work.