

The materials used in manufacturing hydraulic seals are also vital to their performance. Common materials include rubber compounds, polyurethane, and PTFE (Polytetrafluoroethylene). Each material offers different advantages and is selected based on the operating environment. For example, PTFE seals are highly resistant to chemicals and extreme temperatures, making them ideal for demanding applications.
2. Space Efficiency Traditional crowd management solutions, such as fixed barriers, can be cumbersome and take up significant space. Retractable belt queue bollards are space-efficient as they can be deployed only when necessary. Once the event or peak hours are over, they can be retracted, allowing for free movement and maximum utilization of space.
However, the square manhole cover does come with its own set of challenges. Theoretically, if a square cover is positioned diagonally over the hole, it could fall through. This poses a risk that is inherently absent with round covers. Thus, the use of square manhole covers can be seen as a compromise—acknowledging both aesthetic and practical concerns while also embracing the complexities of urban infrastructure.