This paper aims at giving a analytical approach of the stability analysis of control pressure components in pneumatic domain. Some authors have given some results in linear case especially in the hydraulic context [Meritt 1960, Mac Cloy et al 1980, Margolis 1997, Alirand et al. 2002]. The structure and the technologies of commonly used pneumatic pressure control component are firstly introduced, and then a non-linear model is proposed as the basis for the stability analysis. The classical linear method, based on the tangent linearized model is applied to determine the analytical stability conditions using Routh-Hurwitz criteria. The root loci are finally studied according to a set of equilibrium points which corresponds to various conditions of use. In this last part, an existing pressure regulator is used as an example and allows the development of an analysis concerning the dynamic performances on realistic basis. To conclude, the proposed approach gives a set of design rules which enables the system parameters to be sized according to the required dynamic performances and stability.