Pilot-control stage for a proportionally controlled high-pressure hydraulic valve

Abstract

Example pilot-control stage for a proportionally controlled high-pressure hydraulic valves are disclosed. An example pilot-control stage includes a housing of a hydraulic valve, the housing comprising a piston chamber, a guide piston disposed within the piston chamber to move in an axial direction along the piston chamber, the guide piston having an aperture and a tappet, a compensating piston extending into the aperture, where the compensating piston moves in an axial direction along the aperture to define a compensating chamber, a bore fluidly coupling the hydraulic valve to the compensating chamber, an electromagnetic coil at least partially surrounding the piston chamber, and high-pressure seals between the compensating piston and the control piston, and between the tappet and the housing, where the control piston acts as an electromagnetic armature and current applied to the coil moves the guide piston and the tappet, and where the high-pressure seals isolate the piston chamber from the high-pressure areas.