Patent ID: 6176261
Filing Date: 2001-01-23
Classification: F04B,F15B,Y10T

Abstract:
Hydraulic control device (S) for the direction control of at least one extreme high hydraulic pressure hydro-motor (M, M') with working pressures above about 450 bar from a pressure source (27), characterised in that said hydro-motor (M, M') via at least one consumer line (A, B) and two leakage-free black/white directional seated valves (WA, WB, WA') selectively is connectable with said pressure source (27) or a return line (R), that within said consumer line (A, B) a load holding blocking valve (LA, LB) is provided having a leakage-free seated valve design, that between said pressure source (27) and said return line (R) a 2/2 idling or shunting directional seated valve (V) equipped with a hydraulic actuation (E) is provided which in its blocking position blocks any communication from pressure source (27) to return line (R), and which in each of its switched positions is leakage-free between said hydraulic actuation (E) and said return line (R), and that the hydraulic actuation (E) of said idling directional seated valve (V) is connected between the respective load holding blocking valve (LA, LB) and one of said of black/white directional seated valves (WA, WB) with said consumer line (A, B) via a pilot line (9A, 9B, X, Y).