How the Concrete Pump Works 

Concrete Feeding

• Typically, a transit mixer truck backing up to the pump loads concrete into the rear hopper. The hopper includes a grate to filter out oversized materials that could clog the system.

1. • An agitator inside the hopper continuously stirs the concrete to prevent separation of aggregates and maintain a consistent flow into the pumping cylinders. It helps avoid blockages and supports smooth operation during continuous pumping.
2. Hydraulic Pumping System
   • A twin-cylinder hydraulic piston pump drives the system, using hydraulic pressure to move two pistons in alternating strokes. As one piston retracts to draw concrete in, the other extends to push it out. This synchronized motion ensures steady output and reduces pressure fluctuations in the line.
   • One piston creates suction to draw concrete into a cylinder from the hopper, while the other piston, under hydraulic pressure, forces concrete out through the S-valve and into the delivery line. This coordinated motion enables high-pressure, continuous pumping.
   • The system alternates strokes, maintaining a continuous flow.
3. S-Valve Function
   • A curved S-valve, also known as the swing valve, directs the flow of concrete from the pumping cylinders into the delivery pipeline. It is designed to handle high pressures and abrasive materials, making it essential for maintaining flow efficiency and reducing wear during long pumping sessions.
   • It swings between the cylinders, switching direction with each stroke.
4. Boom Placement
   • A 4-section, 20-meter boom delivers concrete to precise locations, even over obstacles or into hard-to-reach areas like upper floors, foundations, or between structures. The multi-articulated sections allow for flexible movement in vertical and horizontal directions.
   • The boom is operated via a wireless remote control, allowing the operator to position it precisely while standing at a safe distance. This technique enhances placement accuracy and improves safety by keeping the operator out of hazardous areas near moving parts or unstable surfaces.
5. Delivery
   • Concrete flows through the high-pressure steel pipeline mounted along the boom sections, which is securely clamped and sealed to prevent leaks. The pipeline’s layout follows the concrete boom’s articulated joints, allowing it to flex and extend as the boom moves without interrupting the flow.
   • The discharge hose at the end of the boom directs the concrete precisely into formwork or designated pour areas. It is flexible to allow fine adjustments by the operator and typically includes a rubber tip to minimize splatter and maintain control during final placement.

Key Features of the SCHWING S 20

• Compact size for tight workspaces
• Low unfolding height for restricted sites
• A rock valve system for reduced wear
• Simplified maintenance with fewer moving parts