Patent ID: 8662109

Claim:
A proportional pressure control valve, comprising: a valve housing having a pump connection, a user connection and a tank connection, said pump connection being a radial bore in said valve housing; a control piston guided for longitudinal movement in said valve housing to connect selectively said pump connection to said user connection and to connect selectively said user connection to said tank connection; a pilot valve with a pilot valve body and a pilot chamber in said valve housing, a movable boundary of said pilot chamber being a closed, planar piston surface lying in one radial plane on said control piston, said pilot valve body being arranged stationary in said valve housing and forming a stationary boundary of said pilot chamber; a proportional magnet system connected to and controlling said pilot valve; and a fluid-conducting connection extending between said pump connection and said pilot chamber and having an axial bore extending in an axial direction within a wall of said valve housing and emerging from said radial bore, said pilot valve body forming an end section of said fluid-conducting connection to said pilot chamber, said end section being remote from said pump connection and containing a radial channel extending between a coaxial inner bore of said pilot valve body and an annular gap forming a filtration gap between a peripheral surface of said pilot valve body and said valve housing, an end of said axial bore discharging into said filtration gap.