A directional control valve is an essential component that enables flow into different paths from different sources in hydraulic and pneumatic machinery. This fundamental part controls the stop, start and direction of flow. In this interactive, online course we will cover the different types of directional control valves and explain the methods used to classify these valves. We will discuss the use of poppet valves, and identify the different types of shear action valves. Lastly, we will discuss replacing valves and correct sizing for flow rate.