Composite manhole covers Φ900mm D400-Advantages of double sealing_Composite manhole covers、Double seal manhole cover、Φ900mm D400 manhole covers、Gas station manhole covers、

Φ900mm D400 Gas station manhole covers and frames,Double seal designs are adopted on the manhole cover and frame respectively.

The first sealing strip on the manhole cover
1. Dustproof, prevent dust and sand from entering.
2. Waterproof to prevent rainwater from entering. The waterproof effect has been strictly tested and can still prevent water from entering even if it is soaked by floods.

The second sealing strip on the well seat frame
Why can BETTER COVER's manhole covers still be easily opened in harsh high-temperature weather?

It should be known that when the manhole cover is closed, especially in hot summer when the temperature is high, the air pressure inside the well is relatively high, while the air pressure outside the well is relatively low. This difference in air pressure will cause the air outside the manhole cover to generate downward pressure, causing The manhole cover is not easy to open.

Appropriate ventilation design is required to balance the internal and external pressure so that the manhole cover can be opened easily.

The second sealing strip of the BETTER COVER well seat frame has the function of properly lifting the manhole cover upward, allowing proper ventilation of the manhole cover and the well seat frame, balancing internal and external pressure, thereby achieving easy opening at high temperatures.

The second passThe oblique cut design of the sealing ring has a large contact surface, increasing the sealing strength, playing a double insurance sealing role.

Double seals, double protection, can act as shock absorbers in the event of force impact, preventing the impact force from moving the manhole cover left and right, and friction from damaging the frame support.



At the same time, in the case of large traffic flow, the shock absorption will not produce any sound, thereby avoiding noise.