tank flange carbon steel manhole cover

manhole covers tank

installed on the top of oil tanker and used for injecting oil ,checking gas recovery,mending the internal inlet.

also can protect the tanker under the emergency. when inject oil,the outside temprature's change will lead the tankers inside pressure to change ,then the manlids breathing valve can  automatically makethe 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.

Feature: 

Steel butt plate,pressure vacuum valve can ventilate the oil tanker,different manipulation.can set up different pressure.

Pressure vacuum valve has the automatically seal function,can avoid the oil leakage.Before completely open the butt plate,double opening device can make the tankers remaining gas to discharge safely.

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