Sanitary Stainless Steel Manhole Cover With Sight Glass

Structural and functional requirements of manhole covers

1. The manhole cover should be equipped with a filling port and an emergency discharge device

2. The injection port should be fully openable and equipped with a secondary opening device

3. The manhole cover should have spare interfaces for installing oil and gas recovery valves, anti-flooding sensors, breathing valves and other valve components.

4. The emergency relief device should be designed to prevent liquid accumulation and ice formation.

5. When closed, keep the manhole cover in a sealed state to prevent liquid or gas from flowing out of the tank

6. When the pressure in the tank is lower than the release pressure, it returns to the closed state