Importance

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Abstract

A precontrolled 3-way pressure control valve with a main valve having, in a valve housing, a valve bore with first, second and third control chambers connected with pressure connection, tank connection, and control connection, respectively, a control piston displaceable in a valve bore, wherein the third control chamber is connectable with the first or second control chambers, and subjectable in opposite direction to pressures from the control connection and pressure setting of a pilot valve. With deviation of pressure applied in control connection from pressure setting of the pilot valve, an imbalance of forces develops in the valve. Oblong holes, distributed over circumference of hollow control piston pass through the wall, are located in the wall radially delimiting its hollow chamber, which holes are longer than clearances between two control chambers. The hollow chamber is connected by a control nozzle on the control piston with a first pressure chamber in front of one end of the control piston, from which chamber a fluid connection leads to the pilot valve formed as a pressure-limiting valve. The control connection is connected with a second pressure chamber in front of other end of the control piston. The control piston is displaceable by pressure in the second pressure chamber against pressure in the first pressure chamber and against force of a spring arrangement by which the control piston is displaceable into position wherein the third control chamber is connected with the first control chamber, connecting the second and third control chambers.

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First Claim