Constant pressure valves made by Water Mechanics are used to keep the pressure above the valve handle constant. These valves are usually used at the intersection of pipelines, because if (at an intersection) there is less resistance in one direction and more consumption compared to the other direction, the problem of water leakage will arise. Therefore, by installing the constant pressure valve on the pipeline that shows less resistance to the flow, the pressure is maintained at the intersection of the pipeline so that the water can be directed to the path that shows more resistance to the flow. These valves are also used to transfer water to the air source and pump outlet.