<p>The present matter relates to tristable solenoid valve being operated with minimum energy in a stable manner. To achieve a transition between the different stop positions in the tristable solenoid valve a single coil of the valve is excited with short positive or negative pulses of appropriate pulse polarity and pulse energy under control of a control unit (50). An intermediate stop position (M) is obtained through supply of a short sequence of pulses which energy content is determined as a function of inertia and certain resonance characteristics of the solenoid valve moving members. <IMAGE></p>
