The S-pipe is a core component in the concrete delivery system of truck-mounted concrete pumps, primarily installed between the pump’s hopper and delivery cylinders. Its key function is to act as a "directional valve"—coordinating with the pump’s dual cylinders to alternately guide concrete from the hopper into the delivery pipeline, ensuring continuous, smooth concrete conveyance during pumping operations.

Typically made of high-wear-resistant materials (e.g., NM450, Q690 steel) or enhanced with hardfacing layers, it withstands severe abrasion from concrete aggregates. Critical to its performance is tight dimensional control: for example, the roundness of its cutting ring mounting position is often kept within 0.05mm to prevent concrete leakage and maintain stable pressure. Its S-shaped structure minimizes flow resistance, reducing the risk of pipeline blockages and ensuring efficient pump truck operation.

Features

It adopts Q345 material with a thickness of 16 mm; 

The main shaft is made of 38CrMoAl and undergoes liquid nitrogen treatment; the hardness of the tooth surface reaches over HB 550; 

The wear-resistant welding at the bottom is added to more than 8 mm; 

The roundness of the cutting ring installation position of the S-pipe is controlled within 0.05mm.