Mechanical Air & Vapor Eliminator for Positive Displacement Flow Meter Systems
In liquid metering systems, even small amounts of air or vapor can significantly reduce accuracy and compromise process control. The FL-XX Series Mechanical Air & Vapor Eliminators are engineered to address this challenge, ensuring that only liquid reaches the meter for precise measurement. By removing air and vapor before they enter the flow meter, these eliminators improve accuracy, protect the meter, and enhance overall system reliability.
These devices are commonly installed at the inlet side of positive displacement meters, typically mounted upright on top of a strainer. During operation, they are connected to a storage tank via piping to collect expelled air or vapor. Once air is removed, the system seals automatically to prevent any liquid loss. This self-regulating action ensures continuous protection without disrupting the flow of the product.
The working principle is straightforward yet highly effective. Air and vapor, being lighter than liquid, naturally rise to the top of the meter system. As they enter the eliminator, they are captured in a cavity above the product flow. A float mechanism inside the eliminator responds to the liquid level: when air is vented, the float rises and seals the vent ports, preventing liquid from escaping. If more air enters, the float drops, opening the vent ports to evacuate the excess air. This cycle continues automatically, ensuring that the metering system consistently receives only liquid.
From a global perspective, this type of device has different names depending on the region. In North America and Europe, it is often called an Air Eliminator or Metering System Air Vent. In the Middle East and Africa, it is commonly referred to as a Vapor Eliminator. In Southeast Asia and Latin America, engineers sometimes call it a Positive Displacement Meter Air Purge Device. Regardless of the terminology, the goal remains the same: enhancing meter accuracy, reducing maintenance costs, and ensuring safe operation.
The FL-XX Series is available in multiple materials and flange configurations to match diverse industrial applications. Options include aluminum, stainless steel, carbon steel, and cast iron, with square or round flanges for different piping layouts. These eliminators are suitable for a wide range of liquids, from refined fuels like gasoline and diesel to LPG, anhydrous ammonia, chlorinated solvents, and acidic solutions.
Installation flexibility is another key advantage. The FL-XX Series can be integrated into a variety of metering setups, allowing for easy alignment with piping, tank connections, and flow meters. This adaptability makes them ideal for oil depots, fuel terminals, chemical plants, and industrial liquid transfer systems worldwide.
In summary, the FL-XX Series Mechanical Air & Vapor Eliminators are more than simple accessories—they are critical components for any liquid metering system, protecting meters from air-induced errors, reducing downtime, and supporting precise, reliable measurement under demanding industrial conditions.
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