Proportional Directional Control Valves for Mobile Applications Presentation Presented by Randall Bobbitt, CFPAI, Danfoss Power Solutions. An extensive study of Open Circuit proportional work function control requirements for today’s off-road mobile equipment including: Proportional spool valve design basics. Comparison of Industrial vs Mobile work function control requirements. Variable pump vs Fixed pump system considerations. Open Circuit Load Sensing systems. Deep dive into pre-compensated vs post-Compensated work function control. Latest development trends for Open Circuit work function control. Outcomes The course educates fluid power professionals in the understanding and application of proportional directional control valves used in the everyday mobile hydraulic applications.