Sufficient conditions are derived to solve the problem of robust regional stabilisation of linear systems with nonlinear, uncertain structure and uncertain order. The problem of increasing the speed and accuracy of uncertain spool-valve actuators is studied. The robust regional stabilising control technique is applied to compensate for the large variations in the uncertainties of the electro-pneumatic actuator. The problem of the robust stability of the electropneumatic actuator is proved to always be solvable, via an independent of the actuator＇s uncertainies static state feedback law depending only upon the stability margin. The closed loop response remains satisfactory for all values in the uncertainty domain.