DN450 Hand-Built 5-Arch Anti-Settling Rubber Expansion Joint with SS304 Flanges (900Mm)

This heavy-duty DN450 (18-inch) hand-built rubber expansion joint is structurally configured for large-scale water treatment infrastructure and chemical processing lines experiencing severe soil settlement or structural misalignment. Engineered with a specialized 900mm face-to-face long-span dimension and an advanced 5-arch geometry, this heavy-duty rubber bellow provides unmatched multidirectional displacement capacity, absorbing massive axial elongation, compression, and lateral shearing forces simultaneously. Operating within a 40-60°C temperature profile under a -0.04MPa (vacuum) to positive pressure fluid cycle, this robust rubber flexible joint safeguards large-diameter headers against structural stress fractures.

The multi-layered composite body is meticulously hand-built by embedding premium high-tensile synthetic fiber cords and rigid external vacuum-reinforcing steel rings directly within a thick, high-purity EPDM rubber matrix. These structural rings act as an external skeleton between the waves, preventing localized deformation and suction collapse during negative pressure phases. Synthesized from premium elastomers, the liner provides superior chemical resistance against water treated with aggressive chemical agents, dosing additives, and mild acidic/alkaline process effluents.

Departing from traditional full-face rubber designs, this assembly utilizes a high-performance ring face sealing (reduced face) profile. A solid internal anti-pullout steel O-ring core is vulcanized directly inside the narrow sealing rim, establishing a positive mechanical lock within the flange groove to prevent bead unseating under sudden hydraulic surges or extreme lateral offsets. Outfitted with corrosion-resistant Stainless Steel 304 PN10 swivel backing flanges, the backing rings rotate a full 360 degrees to facilitate bolt-hole alignment across wide installation gaps without imparting installing pre-stress to the rubber body.