AUTOMATIC PUMP FOR INTRODUCING LIQUID FERTILIZERS IN THE IRRIGATION WATER

摘要

The invention relates to an automatic pump for introducing liquid fertilizers in the irrigation water. According to the invention, the pump uses an assembly consisting of a double diaphragm pump, a distributor () with hydraulic control and a group of valves () ensuring the injection of the fertilizer into the irrigation water, the control of the distributor () in some injection chambers () being connected to the water pressure by some nozzles () and to some driving chambers () by some valves () and, when the diaphragms reach an end, they open the valves by some rods () thereby causing a pressure drop in the control circuit, which leads to the unbalance of the slide valve of the hydraulic distributor () and to the change-over thereof, in which position the pressure in the control chambers is balanced through the nozzles (), and, due to the differences of the surface () on which the hydraulic distributor () performs the closing, there occurs a force which maintains the slide valve assembly in the actuated position.