DN350 PN25 Heavy-Duty Single-Sphere Rubber Expansion Joint with Segmented Flanges and Integrated Tie-Rod Holes

This heavy-duty single-sphere DN350 rubber expansion joint is custom-engineered for maximum performance under critical PN25 (2.5 MPa / 25 bar) operating pressures. Drilled strictly to EN 1092-1 / GB specifications with a robust 16-bolt pattern, this high-pressure expansion bellow is purpose-built for the positive-pressure discharge lines of high-head water pumps. It efficiently attenuates severe structural vibrations, lowers acoustic noise, and compensates for axial and lateral pipe movements in high-velocity fluid networks.

Constructed from premium, high-density EPDM rubber, the main elastomer body delivers exceptional thermal stability and ozone-aging resistance. This molded rubber flexible joint features an unlined full-bore interior, completely omitting negative-pressure vacuum rings. This creates a perfectly uniform, smooth inner wall that minimizes hydraulic flow resistance, prevents micro-vortex erosion, and extends operational lifespan under high-velocity positive-pressure flow streams.

To overcome spatial constraints in ultra-compact pump rooms, this unit features customized segmented flanges where the top and bottom edges are precision-machined flat. This flattened geometry prevents clearance interference with pump casing protrusions, low structural steel frames, or adjacent parallel piping systems. Additionally, the unit incorporates an integrated 6-hole limit rod system directly within the flange perimeter, eliminating bulky exterior gusset ears. This arrangement rigidizes the assembly against axial thrust and severe water hammer up to 25 bar, while providing ample wrench clearance to torque down highly recessed pipe bolts. We specialize in custom-to-drawing engineering based on your CAD prints, ensuring premium B2B quality control standards and exceptionally short lead times to avoid installation delays.