| 摘要 |
PCT No. PCT/DE87/00403 Sec. 371 Date May 4, 1988 Sec. 102(e) Date May 4, 1988 PCT Filed Sep. 4, 1987 PCT Pub. No. WO88/01697 PCT Pub. Date Mar. 10, 1988.A hydraulic idling-regulating valve comprising at least two mechanically operated through-flow valves which can be controlled to move alternatively into a flow position and a closure position and which are both closed in a neutral central position. An electromechanical specified-value setting system positions the piston of a hydraulic drive cylinder, which system comprises a hollow shaft that can be rotated by a number of revolutions correlated with the specified value, and an actual-value feedback system is provided which comprises a feedback spindle which is in engagement with an internal thread of the hollow shaft and which performs a number of revolutions correlated with the piston movement. The valve-actuating element is subjected to the same displacements as the specified-value setting shaft. A casing is provided with a circular cylindrical core having a first longitudinal bore for accommodating the pistons of a pair of valves for displacement between longitudinally movable stop elements, and another bore accommodating the hollow shaft in rotatable and displaceable relationship. The stop elements are axially and radially supported at the hollow shaft by pivot pads. The casing is provided with a circular cylindrical envelope. The connection spaces on the pressure-source side and on the consumer side are delimited by external grooves in the cylindrical core, inlet and outlet ducts are defined by radial bores in the core and in the envelope.
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