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Concrete Pump Swing Levers for Putzmeister are mainly made of cast steel or high-grade steel. They are attached to the shafts of the S-valves using either a DIN spline or keyway spline. The swing lever is then pushed by a hydraulic cylinder, which rotates the S-valve. This mechanism is essential for the proper functioning of the concrete pump, as it controls the flow of concrete and ensures that it is delivered smoothly and efficiently.