The manhole cover is installed on the top of the tank, with tilting overflow prevention, emergency explosion-proof function, equipped with built-in breathing valve, when there is a pressure difference inside and outside the tank, will automatically enter air or exhaust to adjust the pressure inside the tank, so that transportation is safer and environmental protection; When the tank car accident in high temperature environment, the device automatically exhaust, release the tank pressure to ensure the safety of the tank body; With two open, open the pressure plate, small cover around the release of residual pressure in the tank, protect the staff from pressure impact; The manhole cover is equipped with three auxiliary openings for the installation of oil and gas recovery valve, overflow check rod, gauge hole or external breathing valve; The clamping installation method replaces the traditional flange type, making the installation more convenient and reliable. Suitable for shipping gasoline, diesel oil, kerosene and other transportation. The breathing valve is installed on the top of the tank or the manhole cover, used to adjust the pressure difference between the inside and outside of the tank, according to the different scope of use to set different opening pressure, to avoid the occurrence of oil splash and other accidents in the working process, to ensure the safety of the tank. Comply with GB/ T18564.1-2006 standard. It has the function of dumping and overflow prevention, high sensitivity of exhaust and suction. There are built-in and external installation methods. Submarine valve also known as emergency shut-off valve, installed at the bottom of the tank car, body. Equipped with cutting groove, when the seabed valve by violent external force, the valve body will be disconnected along the cutting groove, under the condition of not affecting the tank seal to achieve the bottom of the pipeline in the tank separation, so as to effectively prevent the tank oil leakage, ensure the safety of transportation. The surface of aluminum alloy is oxidized and has strong corrosion resistance. High quality stainless steel filter screen and large flow input and output. When pneumatic can not be opened, can be manually opened. The unloading valve is installed at the bottom of the side of the tank truck. It adopts a fast connection structure and is an important part for filling oil products at the bottom. It can realize fast separation without leakage and make loading and unloading oil more safe and reliable. The handle is provided with a gear, can be adjusted according to the flow, the main body of aluminum alloy material, light and firm. Suitable for loading and unloading gasoline, diesel, kerosene and other light fuels. Oil unloading reducer connector is used for fast unloading, different caliber conversion, oblique lower Angle outlet design, convenient gravity unloading oil, make oil discharging faster, and can effectively protect the hose, the negative end interface and oil unloading valve are REQUIRED by API Rp1004 standard, can be connected with the standard API connector. Product surface oxidation treatment, strong corrosion resistance, aluminum alloy casting molding, durable. The visible flange is installed at the flange of the unloading port, made of transparent material, which is convenient to observe the oil transmission in the pipeline. The seal cover is used to keep the oil discharge valve clean and tidy, prevent dust, water and other impurities from entering, protect the outer surface of the oil discharge valve interface from being damaged, and prevent oil leakage when the oil discharge valve is not tightly sealed. Aluminum alloy material after oxidation treatment, corrosion resistance is strong, light and durable, the interface standard is in line with API Rp1004 standard, can be connected with the standard API, valve body is equipped with lead sealing hole, can be applied lead sealing. The oil and gas recovery valve is installed on the manhole cover or tank top to ensure that the tank body does not spill over. The export end is connected to the oil and gas recovery pipeline through the bellows. When the tank truck is loading and unloading oil, the control gas is output from the tank or input to the tank, which is a key component to realize the oil and gas recovery. Surface oxidation treatment, strong corrosion resistance, sequence control, through the current valve opening series control of the next valve opening. The side plate air valve is installed on the oil and gas recovery pipeline at the rear end of the tank truck. The outlet is at a 45 degree Angle downward and horizontal to prevent dust and debris from entering the valve. It is in a normally open state to control the gas input and output of the oil and gas recovery pipeline. The surface is oxidized and has strong corrosion resistance. It is interlocked with the oil and gas recovery joint. After the oil and gas recovery joint is opened, the ventilation valve needs to be closed. The oil and gas recovery joint is installed at the bottom of the tank car near the unloading port. It adopts a fast connection structure and is an important part of the tank car to control the oil and gas input and output and realize the oil and gas recovery. The valve body is equipped with a pneumatic interlocking valve, which can be touched by the butt of the valve to control the side plate vent valve. Aluminum alloy material, surface oxidation treatment, has a strong corrosion, internal parts of stainless steel material, long life. The anti-overflow probe rod is suitable for the tank truck to detect the situation in the tank and the loading platform when the oil is being filled. The control system is used together to ensure the safety and reliability of the lower installation and avoid overflow. HFY02 anti-overflow socket is used to transmit static signal and overflow signal between tank truck and loading platform, which can effectively ensure the safety and reliability of filling oil products when implementing bottom filling. Ground bolt The ground bolt is fixed on the car site and used to detect the grounding of the tank car. It is made of copper to avoid rust and corrosion. Can effectively ensure its electrical conductivity. HFY01 overflow prevention probe rod, HFY02 overflow prevention socket and ground bolt are used together to form overflow prevention system. Receive stents for tank car manual type control system, according to the need to configure the number of operating handle, - only handle - only manual control valve, when the handle to open in place, will be automatically reset, without external force is fixed in the open position, and can match rod for remote control, in the case of an accident emergency and rapid the closure of the control system, equipped with fusible piece on a support, When the ambient temperature is higher than 75 degrees, the operating handle in the open state will automatically reset and close. The button valve is installed in the tail of the tank truck away from the unloading port position, as the pneumatic system emergency control switch, connected to the pneumatic combination switch emergency vent, in loading and unloading oil if there is an accident, press the button valve, the pneumatic combination switch will immediately close, pneumatic valve also follow the closure. The pneumatic interlocking valve is installed on the oil and gas recovery joint or unloading valve for pneumatic interlocking, and can also be used as an emergency exhaust valve, with a self-reset function, when the switch is pressed, the edge is released to return to the initial state.