Self Leveling Ductile Iron Manhole Cover

Road manhole covers may settle or become uneven after years of use. These changes can create bumps and dips on road surfaces, affecting driving comfort and increasing safety risks.

Our Dingjian Self Leveling Ductile Iron Manhole Cover provides an effective solution for these problems. The cover and frame are connected as an integrated structure. They move with the surrounding pavement during settlement, helping maintain a level surface over long-term use.

This design prevents the cover from becoming higher or lower than the road surface and helps improve overall road smoothness.

This self leveling ductile iron manhole cover meets the B125 load rating and supports a load capacity of 250 kN. It is suitable for sidewalks, residential roads, school zones, and other areas with relatively low vehicle speeds.

The cover features a noise reduction design. A rubber seal is installed between the cover and frame. When vehicles pass over the cover, the seal absorbs impact and reduces metal-to-metal noise.

This feature is especially useful in areas near homes, schools, and hospitals. The seal also helps prevent sand and water from entering the gaps while keeping the cover easy to open during maintenance.

We have improved the mold design for this self leveling system. Changxing Jianguo Ductile Iron Manhole Cover Factory has operated under the Dingjian brand since 2008 and has continued to improve product performance.

This self leveling cover is one of our key product developments. The frame uses a wider flange design, which increases contact with the road surface. It distributes vehicle loads over a larger area and reduces local settlement around the cover.

We inspect every frame for flatness during quality control. Each set meets our flatness requirements before delivery.