Patent ID: 6874526
Filing Date: 2005-04-05
Classification: F15B,Y10T

Abstract:
1. A hydraulic control device for load pressure-independent control of a double-acting motor with a directional-control valve, whose housing has a longitudinal bore that contains a control slide valve element, which has piston sections for controlling the direction and speed of the motor and has a transverse conduit that is connected upstream of the piston sections used for directional control and contains a two-way pressure balance regulator whose pressure balance regulator throttle slide valve element can be acted on by a spring counter to a differential force between two control pressures, wherein the throttle slide valve element is disposed in a second longitudinal bore that can be obturated in relation to the outside by at least one obturating plug at the end, characterized in that by replacing the pressure balance regulator throttle slide valve element ( 68 , 93 ) but using the same housing ( 13 ), the control device ( 10 , 90 ) can be converted from a directional-control valve ( 11 ) with a primary individual pressure balance regulator ( 12 ) for load pressure-independent control to a directional-control valve ( 91 ) with a secondary individual pressure balance regulator ( 92 ) for an oil flow distribution in the event of undersupply.