Pressure regulating valve, in particular proportional pressure regulating valve

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.