This diagram shows a water circulation system, of which the operation is more or less independent of the gravity.

The pump is driven by compressed air. An electro-pneumatic valve is controlled by the water level in the closed containers via an electrode. If the water level becomes too low the air pressure is released and the neighbouring container will be pressurized. In the mean time the low level container can be refilled. Two valves cause that water is flowing in one direction only.

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