Sylvie Willis
An overfill prevention valve (OPV) is a device used to prevent a fuel tank from overfilling and spilling. When the fuel tank being filled becomes full, the valve closes automatically, preventing any further fluid from being dispensed. OPVs are usually installed during the manufacturing stage of the tank and are designed to shut off at 95% tank capacity, in accordance with EPA regulations. They are available for both underground and above-ground storage tanks, with different models suited to gravity-filled or pumped-in fill applications.
| Characteristics | Values |
|---|---|
| Function | Prevent overfilling of fuel tanks |
| Installation | Installed onto a fuel storage tank at the tank manufacturing stage |
| Operation | Float-operated, two-stage shut-off valve system |
| Activation | When the fuel oil level increases to approximately 95% of tank capacity |
| Compatibility | Compatible with diesel, No. 2 fuel oil, alcohol, gas, and biofuel |
| Models | Model 71, Model 61F-Stop, Defender Series |
| Application | Applicable to both underground and above-ground storage tanks |
| Benefits | Environmental protection, cost savings, and convenience by preventing fuel spillage |
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What You'll Learn
- How it works: Float rises with fuel, closing valve at 95% capacity?
- Installation: Installed as an integral part of a 4 drop tube assembly
- Compatibility: Compatible with diesel, alcohol, gas, biofuel, and more
- Safety: Prevents spillage, environmental damage, and saves costs
- Alternatives: Tank overfill alarms provide an audible or visible warning
How it works: Float rises with fuel, closing valve at 95% capacity
An overfill prevention valve is a safety device that prevents fuel tanks from being overfilled. It is installed onto a fuel or AdBlue™ storage tank at the tank manufacturing stage. When the storage tank being filled becomes full, the valve closes, preventing any further fluid from being dispensed and stopping spillage from occurring.
The OPV is designed with a primary shutoff that will activate between 85% and 92% of tank volume, depending on the tank's diameter. After the primary shutoff is activated, the flow through the valve is limited. A secondary positive shutoff will occur at 95% tank volume if filling continues.
The OPV works by employing a float that rises with the fuel. As the liquid level in the tank approaches 95% capacity, the liquid level raises the float. As the float rises, it actuates the external/internal magnetic couplers, which release the flapper to be closed by the flow of the product. As the float continues to rise, the internal mechanism pushes the flapper further into the product flow, allowing actuation at high or low flow rates.
This sudden reduction in flow caused by the primary flapper closing creates a "line shock" to the fill hose, which signals the delivery driver that the tank is nearing 95% capacity. The OPV design allows positive shutoff without a single penetration in the valve body, meaning there are no leak or vapour paths. The Defender Series OPV provides safe, rapid, and reliable fuel drops with simple installation, service, and remote testing capability.
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Installation: Installed as an integral part of a 4 drop tube assembly
The installation process for a fuel tank overfill prevention valve is a precise procedure that ensures the valve functions effectively as part of a 4-drop tube assembly. This assembly is an integral component in the fuel tank system, playing a critical role in preventing overfilling and ensuring the safe and efficient operation of the fuel tank.
The 4-drop tube assembly is a carefully designed system that allows for the controlled filling of the fuel tank. It consists of a series of tubes that extend from the fuel tank and provide a controlled path for the fuel to flow during the filling process. The fuel tank overfill prevention valve is strategically installed within this assembly to regulate the fuel flow and prevent overfilling.
The installation process typically involves the secure integration of the valve into the 4-drop tube assembly. This assembly is designed to be a permanent fixture within the fuel tank system, and the valve becomes an intrinsic part of it. The valve is positioned at a specific point along the tubes to allow for accurate monitoring and control of the fuel level during filling.
The integration of the valve ensures a seamless and secure connection with the tubes. This is achieved through precise engineering and the use of specialized fittings or welding techniques. The installation process adheres to stringent industry standards and manufacturer specifications to guarantee the structural integrity and functionality of the valve within the assembly.
The installed valve operates by restricting the fuel flow once the tank reaches a predetermined level, thereby preventing overfilling. This critical function safeguards the fuel tank from potential overfill-related incidents and ensures the safe containment and management of the fuel. By being an integral part of the 4-drop tube assembly, the valve becomes an essential safety feature, contributing to the overall reliability and efficiency of the fuel tank system.
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Compatibility: Compatible with diesel, alcohol, gas, biofuel, and more
An overfill prevention valve is a device that is installed onto a fuel storage tank to prevent it from being overfilled. When the tank becomes full, the valve closes, stopping any further fluid from being dispensed and preventing spillage. These valves are designed to satisfy EPA regulations, which require "a device that will automatically shut off the flow of oil into the tank when the tank is no more than 95% full".
The compatibility of these valves with various fuel types is an important consideration. They are commonly used with diesel fuel, as in the case of the Model 71 valve, which is designed for underground diesel storage tanks. Diesel fuel is a petroleum-based fuel commonly used in compression-ignition engines. Biodiesel, a type of biofuel, can also be used as a blending agent with diesel fuel. Biofuels are renewable fuels produced from biomass materials, and they can be used to meet transportation fuel needs.
Ethanol, also known as ethyl alcohol, is another type of biofuel that is compatible with overfill prevention valves. It is a renewable alcohol-based fuel that can be blended with gasoline to increase octane and reduce carbon monoxide emissions. Ethanol is often used as a blending agent with gasoline to create fuel blends such as E10 and E15, which are approved for use in conventional gasoline-powered vehicles. Flexible fuel vehicles can even run on E85, a blend with a much higher ethanol content.
Biodiesel, as mentioned earlier, is another biofuel option that can be used with overfill prevention valves. It is produced from oily plants, such as soybean or oil palm, and is compatible with diesel engines. Biodiesel can be blended with petroleum diesel in various percentages, including B20, which contains 20% biodiesel, and B100, which is pure biodiesel.
In addition to diesel, alcohol, and biofuel compatibility, overfill prevention valves can also be used with gas. Gasoline is a petroleum-based fuel commonly used in vehicles and can be blended with ethanol or biodiesel to create renewable fuel options. The compatibility of overfill prevention valves with gas ensures their versatility and applicability in various fuel storage and dispensing systems.
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Safety: Prevents spillage, environmental damage, and saves costs
Overfill prevention valves are an essential safety measure for fuel tanks, offering a robust defence against spillage and the environmental damage that follows. As the name suggests, these valves automatically shut off the flow of fuel when a tank reaches a certain level, typically around 95% capacity. This mechanism not only prevents overfilling but also stops fuel from accidentally spilling out, causing environmental harm and incurring costly clean-up operations.
The prevention of spillage is a critical function of these valves. By automatically shutting off the fuel flow, they ensure that fuel does not overflow from the tank, reducing the risk of spills and leaks. This is particularly important for underground storage tanks, where a leak could have devastating consequences for the surrounding environment.
The environmental benefits of these valves are significant. By stopping fuel spills, they prevent the contamination of soil and groundwater, which can have long-lasting ecological impacts. Additionally, they help to reduce the risk of fuel vapours escaping, further minimising the environmental footprint of fuel storage.
The cost savings are also noteworthy. Clean-up operations for fuel spills can be extremely expensive, and the costs of repairing or replacing damaged tanks and equipment can be significant. By preventing spills and reducing the likelihood of equipment damage, overfill prevention valves offer a cost-effective solution for fuel storage.
Furthermore, these valves can be installed on both underground and above-ground storage tanks, making them versatile and adaptable to different fuel storage setups. They are designed to work with various fuels, including diesel, fuel oil, and biofuels, ensuring broad applicability in the fuel storage industry.
In conclusion, overfill prevention valves play a crucial role in enhancing the safety of fuel storage operations. By preventing spillage, they not only minimise environmental damage but also help to avoid the costly consequences of fuel spills. With their automatic shut-off mechanisms, these valves offer a reliable solution for fuel storage facilities, contributing to both ecological preservation and economic savings.
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Alternatives: Tank overfill alarms provide an audible or visible warning
Tank overfill alarms are an alternative to overfill prevention valves, providing an audible or visible warning when the tank is almost full. This warning alerts the delivery operator to stop filling the tank. Overfill alarms are a regulatory requirement within the OSR if it is not possible to view the tank vent from the filling location.
Overfill alarms can be used to detect when a tank containing chemical liquids is almost full, helping to prevent a wide range of potential hazards. These hazards include environmental damage, such as spills and leaks, which can cause serious harm to wildlife, soil, water, and the air and ground. Overfilling a tank can also pose a serious risk to human health and safety.
A high-level alarm system can also help to prevent equipment damage by detecting when the liquid level in a tank is too high. When a tank is overfilled, the chemical can react with the tank material, increasing pressure or even causing an explosion. An overfill alarm system can be designed to work with different types of tanks and liquids and can be adapted to suit the specific requirements of the facility.
The TS-RA1 is an example of a remote audible and visible alarm unit that can be used as an overfill alarm. It features a pulsating light and a piezoelectric buzzer to warn of alarm conditions. It can be combined with a TS-RK remote acknowledge unit to provide options for silencing the alarm.
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Frequently asked questions
A fuel tank overfill prevention valve is a device that prevents the overfilling of a fuel tank. When the fuel tank becomes full, the valve closes, preventing any further fluid from being dispensed and stopping spillage from occurring.
A fuel tank overfill prevention valve is a float-operated, two-stage shut-off valve system. The float rises with the fuel and closes a valve at a set height, usually when the tank reaches 95% capacity.
Fuel tank overfill prevention valves are useful for both environmental reasons and to save the cost and inconvenience of spilt fuel. They also ensure compliance with EPA regulations, which require "a device that will automatically shut off the flow of oil into the tank when the tank is no more than 95% full."
