Manhole cover is installed on the top of the tank to prevent the
fuel leakage when tank is over rolled, built in P/V vent to adjust
the pressure, when there is pressure difference between inside and
outside the tank.It will automatically inlet or echaust air when
there is accident or under high temperature, it will adjust
pressure so that it can ensure the safety and environmental
protection. It has second class open design, when open the up
binder plate, it will release the pressure out to prevent the
worker from the pushing over; in the main plater of the manhole,
there are two blingding holese can be installed with optic senor,
dip thbe or ternal vacuum valve according to the user\'s demands;
hooped connecting way, which instead of flanged connecting to make
the installation more convenient and reliable. It is suitable to
transport petroleum, diesel, diesel, kerosene and the other light
oil and so on.
