This paper is devoted to an approximation technique for a PD regulator applied in an electromagnetic valve actuator control. Very high spikes in the presence of unavoidable noise measurements are produced by PD regulators. These spikes are reasons of high power dissipation and bad dynamics with no precision. The method introduced in this contribution gives the possibility to reduce the noise effect by means of a minimal variance method. Good dynamic performance with low dissipation and soft landing are ensured by the obtained results. The technique is a common one and it can be used in any kind of system. A feasible real time self-tuning of an approximated PD regulator is also introduced in this contribution. Robustness is obtained in the proposed loop control.