Intelligent control valve

A control valve is a very expensive part of a control loop; its implementation requires a high level of mechanical treatment. The authors indicate how computer technology simplifies and reduces in price the expensive classic realizations (implementations) of the control valve. They indicate the possibilities and some kinds of solutions and present experimental results and practical implementations for some of these solutions. The microprocessor-controlled valve is able to take over a part of the controller´s function, especially when the controller alone is not able to remove a large disturbance.