Pressure control valve for use in e.g. hydraulic assembly in tunnel construction, has valve piston regulated by axially running blind hole, and valve piston comprising outer wall causing differential pressure that unloads valve spring

摘要

The valve (1) has a valve piston (5) regulated by an axially running blind hole (9). Radial drills (10) are formed in an end region (8) of the blind hole. The radial drills are circularly arranged distanced from each other in two planes (11, 12). A circular channel (15) joins the planes of the radial drills and is formed on a valve housing (2). The channel passes in a pressurized fluid inlet (6) formed perpendicular to the blind hole. The valve piston has an outer wall (21) causing a differential pressure that unloads a valve spring (3).