| 摘要 |
PCT No. PCT/NO86/00001 Sec. 371 Date Sep. 29, 1986 Sec. 102(e) Date Sep. 29, 1986 PCT Filed Jan. 6, 1986 PCT Pub. No. WO86/04120 PCT Pub. Date Jul. 17, 1986.Hydraulically controlled value with a movable body (10) that is kept in neutral position under tension by two spring units (21, 22) between two pressure chambers (8, 9). The pressure chambers are connected by a common controlling conduit (25) for the signal medium. A hydraulic accumulator (30) is connected to one of the pressure chambers (9). It is possible to determine the natural frequency of the accumulator and its connector tube. By varying the pressure on the signal medium with a frequency which corresponds with the natural frequency of the accumulator (30), the body is set in motion between open and closed position, with a corresponding frequency. The body (10) is preferably formed as a valve slide for direct control of a valve. Alternatively, the body can mechanically actuate a valve etc. by means of, for example, an actuator or an electric sensor.
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