The four-valve automatic compensating system as developed by David James Blaikley has become an integral part of the professional euphonium in use today. While the Blaikley system was designed to allow a euphonium to play chromatically down to the fundamental pitch of the instrument, it was hardly the only design to do so. Using a historical analysis of euphonium valve systems, the case is made for why Blaikley's design has been widely adopted in the face of criticism about the four-valve automatic compensating system. The analysis also clarifies the viability of Blaikley's, as well as others', euphonium valve system designs based upon the four factors of intonation, range, intuitiveness of use, and weight. These factors are further explored in a rubric in order to quantify the results of the analysis.