Double Spool Servovalve Family

A family of cost-effective, high performance, electro-hydraulic servovalves has been developed for mobile and industrial machinery applications. The development was motivated by cost pressures on mobile and industrial closed loop servo system applications. The servovalve consists of a closed loop, pressure control pilot stage valve mated with a unique double spool design boost stage valve. It has been configured in both a flow control version and a pressure control servovalve version. Operating principles, performance characteristics, and general application are described.