| 摘要 |
The device is intended, in particular, for the automatic control of ventilation shutters in animal-rearing premises. The shutter 6 is kept shut by a hydraulic or pneumatic cylinder 14 and is preloaded in the opening direction by a counterweight 8. The pump or compressor 26 is driven by an electric motor 28. In the event of failure of the electricity supply system, the motor 28 stops and the pressure in the cylinder 14 escapes via a discharge circuit 34-36 and through the pump or compressor 26. The counterweight 8 opens the shutter 6, which ensures the ventilation of the premises. <IMAGE>
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