HYDRAULIC FORCE REDUCTION IN A MANUALLY-OPERATED DIRECTIONAL CONTROL POPPET VALVE - EXPERIMENTAL RESEARCH

Raw results data of experimental research work on prototypes regarding the use of hydraulic force reduction in a manually-controlled directional control valve, intended for controlling powered roof supports in longwall complexes in hard coal mines. Hydraulic force reduction is essentially intended to reduce the forces acting on valve elements, which enables their enlargement and, consequently, increases flow. The basic problem that was investigated was the potential loss of the high seal level when closing the flow of hydraulic fluid, which is an important feature of directional control poppet valves.