| 摘要 |
The reversible motor (1) engages the tooth gear (3), which is close-connected with the bolt (4), by means of the pinion (2). When rotating the bolt (4), the nut (5), which is close-connected with the cone of the controlled valve, shifts in the vertical direction. When the cone reaches the extreme position, the nut (5) stops and the bolt (4) moves in the vertical direction. The ball bearings (9, 11) are moveably mounted on the upper cylindrical part of the bolt (4) and the disc springs (15) are located between them. By action of the disc springs (15), the lower ball bearing (9) bears on the bolt shoulder (4) and the upper ball bearing (11) bears on the expander ring, which is fixed on the bolt (4). The disengaging lever of the switches (16, 17) bears on the outer ring of the ball bearings (9, 11). When the disengaging lever of the adequate switch shifts by the set value, the switch switches off. The switches (16, 17) are adjustably attached to the device frame.<IMAGE>
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