an arrangement for elevating liquid by the use of solar and / or wind energy having a pipe immersed in a liquid , a pipe directed upwardly from the surface of liquid and interconnection for entrapment of liquid , with a pressure differential and an air passage formed alternately and repetitively during presence of solar and / or wind energy , is additionally provided with an air purging element formed as a hydraulic valve with upper and lower interconnected pipes of which the upper pipe has an outlet located above the liquid level .