Double Acting Hydraulic Ram pump animation

The Double-Acting Hydraulic Ram pump (DAHR pump) is a deep-well water pump that converts a large-volume low-pressure oscillation at surface level into a high-pressure pumping effect. Based on the historic hydraulic ram pump, invented by the Mongolfier brothers in the 18th century, it uses the Joukowski (water hammer) effect in place of dynamic pistons/seals. The DAHR pump was invented by engineers at Thermofluidics Ltd. () in 2009 to enable solar heat engines such as the NIFTE a