Laminar Rings Widely Adopted in Shanghai Metro Rail Transit Systems

Our premium metallic laminar seal rings have achieved large-scale batch application across multiple lines of Shanghai Rail Transit, becoming the standard sealing component for metro vehicle bogie journal bearings and wheel set maintenance projects.

As a core labyrinth metal sealing solution, laminar rings deliver unmatched performance for heavy-duty urban rail operating environments. Constructed with multi-layer wound metal sheets, the sets form a reliable multi-channel labyrinth barrier to block tunnel dust, muddy splashes and water infiltration, while effectively retaining bearing lubricating grease without leakageSmalley.

Compared with traditional rubber oil seals, our laminar rings feature ultra-low friction, outstanding fatigue resistance and extended service life — up to 50 times longer than elastomer seals under continuous high-speed metro operation. They maintain stable sealing performance amid frequent start-stop vibration, temperature fluctuations and heavily contaminated underground tunnel conditions, greatly cutting metro fleet maintenance frequency and operational costs for Shanghai Metro’s vehicle overhaul workshops.

Currently, our customized single & double-turn laminar ring kits are supplied for routine overhaul of Shanghai Metro rolling stock including Line 1 and Line 2 trains, passing full rail transit reliability certification after long-term on-track testing. The successful Shanghai Metro case verifies our product’s adaptability to mass urban rail projects, laying solid ground for global cooperation with subway, light rail and high-speed train manufacturers worldwide.

Our factory provides full customization on material (stainless steel, alloy steel), winding structure and dimensional specifications to match diverse rail vehicle sealing demands. Welcome global rail equipment suppliers, transit maintenance contractors and mechanical distributors to inquire about samples and bulk orders.