These directional control valves are otherwise known as switching valves and they are the ones responsible for the flow of liquid in the system. They can stop, start, pause and change the direction of the flow depending upon the system`s requirements, check https://www.tridenthydraulics.co.uk/. They are available as poppet valves, spool valves and rotary slide valves. Their functioning depends upon few factors like power limit defining the flow and pressure, leakage and the switching time. Any change or problem in any of them will hamper the complete process.