A valve part of a hydraulic control valve for controlling flows of pressurized medium is provided. The valve part includes: a cylindrical valve housing with a valve housing hollow space that is open on one side in the axial direction, wherein the valve housing is provided with a radial first work connection (A), a radial second work connection (B), and a radial pressure connection (P), each of which opens into the valve housing hollow space, and a cylindrical control piston is held in the valve housing hollow space so that it can move in the axial direction with a control piston hollow space that is open on one side at an axial control piston hollow space opening. The control piston is provided with a radial discharge connection (T) opening into the control piston hollow space, and the control piston is constructed in such a way that the work connections (A, B) can be connected selectively in a fluid conducting way to the pressure connection (P) and the discharge connection (T) through axial displacement of the control piston. The valve part distinguishes itself in that a cover provided with at least one cover opening is attached to the axial control piston hollow space opening.