Manhole cover is installed on the top of oil tanker and used for loading oil ,checking gas recovery,mending the internal inlet.

Also can protect the tanker under the emergency. When loading oil,the outside temperature’s change will lead the tanker’s inside pressure to change. Then the manhole cover’s breathing valve can automatically make the tanker pressure to the normal level. If some emergency happen , like the tanker overturn, the breathing valve will automatically close to avoid the tanker’s explosion when under the fire condition..

Material:

Body: steel

Exhaust valve: AL alloy 

Safety locker: SS 

Handle:Steel

Seal: NBR

Feature:

All types manhole cover has the breathing valve

Breathing valve's different pressure set can fit different operation requirement

Breathing valve has the automatically seal's function,can avoid leakage under emergency

We can design different kinds of manhole covers as per customers' requirement