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Materials:
weld Ring: Steel
Cover: Steel
Gasket: Buna-N
weld Ring: Steel
Cover: Steel
Gasket: Buna-N
Manhole Cover is equipped on the top of tank truck.
lt is the entrance of fluid transfer operation inspection and maintaining the inside tank. It can protect the tank when involving in an emergency.
Under normal practice，vent is closed When loading and unloading and temperature variation，it will cause the pressure variationinside the tank，such as air pressure and negative vacuum pressure,the vent of manhole cover will be closed automatically in order to keep the tank under a normal pressure.
lt is the entrance of fluid transfer operation inspection and maintaining the inside tank. It can protect the tank when involving in an emergency.
Under normal practice，vent is closed When loading and unloading and temperature variation，it will cause the pressure variationinside the tank，such as air pressure and negative vacuum pressure,the vent of manhole cover will be closed automatically in order to keep the tank under a normal pressure.
