Dear,
Its not possible to run the MRP based on valuation type.Valuation type functionality is to differentiate valuated stock of same material separately in a plant.It is not the parameter to be considered for MRP.
When it comes to MRP, you can have user exit to run the MRP. For example based on Material Type/Material group/MRP type/MRP controller etc...
SPRO Settings :
Regards,
pardhu