Tank Truck Explosion-Proof Manhole Cover

A tank truck explosion-proof cover (manhole cover) is a sealed cover installed on the top of a tank truck body, usually circular or elliptical, integrating sealing, breather valve, and explosion-proof functions. It serves as both an entry point for operators to enter the tank for inspection or maintenance and an interface for loading and unloading liquids (such as crude oil, gasoline, and chemical liquids). Tank truck explosion-proof covers (manhole covers) are widely used in tank trucks transporting petroleum, gasoline, diesel, chemical liquids, etc., and are especially suitable for the transportation of dangerous goods, requiring high sealing and explosion-proof performance.

Main Functions

• Loading and Unloading: Serves as the main channel for loading and unloading liquids in tank trucks, facilitating quick operation.
• Pressure Regulation: Built-in breather valve (P/V valve) regulates the pressure inside the tank during refueling, unloading, or temperature changes to prevent tank deformation or leakage.
• Explosion-Proof Safety: Equipped with an emergency exhaust valve that automatically releases pressure in the event of a fire or abnormal high pressure, reducing the risk of explosion.
• Sealing Protection: Ensures that the liquid inside the tank does not leak and prevents external impurities from entering through sealing rings (such as nitrile rubber or fluororubber).

Structure and Features

• Material: Commonly uses aluminum alloy (lightweight, rust-proof), stainless steel (corrosion-resistant), or galvanized steel (high strength).
• Design: Low-profile design reduces protruding parts and facilitates operation; some models are equipped with quick-opening handles, observation windows, or locking devices.
• Standards: Must comply with industry standards, such as Chinas QC/T 1065-2017 (Manhole Cover for Tank Vehicles for Road Transport of Liquid Dangerous Goods) or international standards (such as DOT-406/407).
• Specifications: Common diameters are DN500 or DN600, and can also be customized.