| 摘要 |
A hydraulic idling-regulating valve (10) comprises at least two mechanically operated through-flow valves (21, 22), which can be alternately controlled in a flow position and a closure position, said valves being both closed in a central middle position, together with an electromechanical specified value setting system for the position of the valve of a hydraulic drive cylinder (14), which system comprises a hollow shaft having a rotation speed correlated to a specified value. Also provided is a system for indicating the actual value, comprising an indicator spindle which engages with an inner thread of the hollow shaft, said spindle effecting a number of rotations related to the movements of the piston. The operative unit of the valve is subjected to the same movements as the specified value setting shaft. The casing (33) has a circular cylindrical core (48) with an initial longitudinal bore (31) in which are arranged the pistons of a pair of valves which can be moved between the stop elements (37, 38), which are mobile in a longitudinal direction, and with another bore in which the hollow shaft is mounted in a rotatable and movable manner, said stop elements being carried axially and radially on pivot pads arranged on the hollow shaft. The casing has a cylindrical circular envelope (49). The connection spaces on the pressure-source side and consumer side are delimited by external grooves on the cylindrical core and the inlet and outlet ducts are delimited by radial borings in the core and casing. |
