Aliuminium Alloy Tank Truck Manhole Cover is installed on the top of the tank truck's oilcan, which has the function of internal respiration and emergency exhausting. The internal respiration valve can balance the oilcan's inside and outside pressure during the transportation. The emergency exhausting equipment will be opened to release pressure if the inner pressure increases sharply .Even if the tank truck has an accident, the internal respiration valve's prevention against overflowing equipment remain sealed, the media inside of the oilcan can't be leaked ,otherwise it may cause serious accident. The manhole cover can install waste gas recovery valve, gauge hatch, etc.
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