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Tank Truck Spare Parts


RKG Series of 16 inch Steel Petroleum Manhole Cover

Manhole Cover is equipped on the top of tank truck.

It 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 variation inside 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.

When involving in emergency, such as a car accident, the Emergency Exhaust Valve will open the inside tank, meets the setting, in order to prevent explosion.

It is internationally accepted, and specified, by oil companies around the world to assist with the safe transportation of petroleum based products.



Cover: 7.14Kpa
Negative opening pressure: Steel
Weld Ring: Steel
Gasket: Buna-N


Technique Specification

Setting pressure of vent discharge: 7.14Kpa
Negative opening pressure: -2Kpa~-3Kpa
Setting pressure of emergency exhaust valve: 0.0266Mpa±0.001Mpa
Pressure resistance: 0.254Mpa

RKG Series of 16 inch Steel Petroleum Manhole Cover
Features & Benefits

Material: Coated steel
Pressure and vacuum vent fitted as standard for tank breathing.
Varous ratings are available to suit operational requirements.
Spring-loaded fill cap provides emergency fire engulfment venting to NTTC DUT 406,required in the event of the tank bding exposed to a fire.
Automatic sealing of the P/V vent in a roll over situation prevents dangerous and costly spillage.
Steel cover arm exceeds the requirements of the Australian DROP tests(AS 2809-2-1990).
Two-stage opening allows safe release of residual compartment pressure before fully opening the fill cap.
250mm(10)fill hole for easy drop pipe insertion when top loading.
High quality baseplate and component materials, to international standards, are used for durability and performance.


RKG Series of 16 inch Steel Petroleum Manhole Cover