| 摘要 |
<p>PCT No. PCT/EP97/02876 Sec. 371 Date Dec. 4, 1998 Sec. 102(e) Date Dec. 4, 1998 PCT Filed Jun. 3, 1997 PCT Pub. No. WO97/47890 PCT Pub. Date Dec. 18, 1997A manually operable hydraulic pilot-control device having a continuously adjustable pressure-reducing valve, having a housing and, in a continuous housing bore, a control piston, actable upon by a control spring in opening direction of a connection between a pressure inlet and a control outlet and is actable upon in opposite direction by pressure in the control outlet, and its control spring is restrained between a first fixed stop of the control piston and a spring retainer, placeable against a second fixed stop of the control piston and is driveable by an axially guided plunger located at a first open end of the housing bore and is supportable spaced from the second stop of the control piston. The control piston is displaceable in a control sleeve put in the housing bore, and an axial position of the control sleeve is adjustable from outside, wherein space in front of one end face of the control sleeve in which the control spring is located is connected to a tank outlet, and wherein two annular spaces are formed between the control sleeve and the housing bore wall. The annular spaces are sealed from one another at the bore wall and from the space in front of one end face of the control sleeve. One annular space is connected to the pressure inlet and the other annular space is connected to the control outlet, and from which in each case at least one radial bore leads through the control sleeve into its interior.</p> |
