The Collaborative International Dictionary of English v.0.48:

Valuator \Val"u*a`tor\, n.
   One who assesses, or sets a value on, anything; an appraiser.
   --Swift.
   [1913 Webster]

WordNet (r) 3.0 (2006):

valuator
    n 1: one who estimates officially the worth or value or quality
         of things [syn: appraiser, valuator]