Abstract: This research which has been titled as “The Phonemic Valve of Dual Phonemes”, has a special discussion on those phonemes which were derived from other languages. It clarifies that voice and intonation, separation and unity are dual phonemes, and they do not have the ability to change their meaning. This research regarding to the principles started with a preface. Besides the preface, all those stuffs required for a preface are mentioned too. Along with main context, the summary, suggestions and reference list are also provided here.