Difference between three-position four-way electromagnetic directional valve and electro-hydraulic directional valve

The electromagnetic directional valve uses the attractive force generated when the electromagnetic coil is energized to push the spool of the slide valve and change the direction of fluid flow. Electro-hydraulic directional valve is a combination of electromagnetic directional valve and hydraulic directional valve, and the action of hydraulic directional valve is controlled by electromagnetic directional valve. The valve core is driven by the pressure oil in the control oil circuit.