|
Parameter |
Value |
|
Brand |
Dingjian |
|
Traffic Pressure |
30 |
|
Type |
Round Manhole Cover |
|
Application |
Power, Municipal Main Roads |
|
Item Number |
Φ730 |
|
Overall Dimensions |
380 × 680 mm |
|
Load Rating |
D400 |
|
Load Capacity |
400 kN |
|
Material |
Ductile Iron |
Dual Sealing System for Better Protection
City main road covers face multiple challenges, including heavy loads, strong vibration, and continuous rainwater exposure. Standard single-seal covers may not provide sufficient protection under these conditions.
Our Dingjian Double Sealed Recessed Drain Cover provides an improved sealing solution. It uses two rubber sealing rings to achieve three key functions: noise reduction, odor prevention, and water resistance.
The item number is Φ730, with overall dimensions of 380 × 680 millimeters. The product meets the D400 load rating with a capacity of 400 kN, making it suitable for heavy traffic areas such as main roads.


How the Double Sealing System Works
The first sealing ring is installed between the cover and frame. Its main function is to absorb vehicle impact and reduce metal-to-metal noise. It also helps prevent rainwater from entering the chamber.
The second sealing ring is positioned deeper inside the structure. It helps block odors and moisture from rising from underground spaces.
These two sealing systems work together to maintain reliable sealing performance. Even in heavy rain and wet drainage environments, this double sealed recessed drain cover provides stable protection.
Recessed Paving Keeps the Road Surface Flat
This double sealed recessed drain cover features a recessed paving design. The surface provides space for asphalt, tiles, or other paving materials.
After installation, the cover remains level with the road surface without creating raised edges or uneven areas. The anti-lifting design improves driving safety by helping prevent the cover from moving under vehicle impact.
Made from high-grade ductile iron, the cover provides excellent impact resistance and can support cars, buses, and trucks on main roads for long-term use.

Strict Testing for D400 Products
Our quality control process for D400 products follows strict inspection standards. We check iron composition before casting and test material performance after treatment.
Load testing is performed for every production batch. Only products that meet the 400 kN requirement are approved for shipment.
We also test rubber seals to verify sealing performance and water resistance. Regular orders are delivered within 15 to 25 days.
We use steel pallets for export packaging and provide a 1 to 3 year warranty.
Hot Tags: double sealed recessed drain cover, China double sealed recessed drain cover manufacturers, suppliers, factory
