Patent ID: 7073533

Claim:
A proportional pressure regulating valve, comprising: a valve housing having at least one pump connection, appliance connection and tank connection, and having a rear pressure chamber; a valve piston displaceably mounted in said valve housing and having a circumference, a front side in fluid communication with said appliance connection and a rear side adjoining said rear pressure chamber; a recess in said circumference defining a circumferential annular space located and extending axially between and selectively connectable to said pump connection and said tank connection; control edges on said valve piston delimiting said annular space; a first passage extending in said valve piston forming a fluid connection between said front side and said rear side of said valve piston, said first passage having a first flow restriction point adjoining said front side of said valve piston; and a second passage in said valve piston extending between said annular space and said rear side of said piston valve, being spaced from said first restriction point and having a second flow restriction point.