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Industrial Grade Asphalt Filter Strainer Unit

The asphalt filter is a crucial purification equipment in the asphalt transportation and production system. It is used to remove mechanical impurities, coke particles, and lumps of solid substances from the high-temperature liquid asphalt, preventing the impurities from blocking nozzles, pump bodies, valves, metering instruments, and subsequent production equipment, thus ensuring the smoothness of the asphalt pipeline and the stability of product quality.

    Main Functions

    Filter and remove impurities such as sand, rust, oxidized lumps, and woven fabric debris from the asphalt, protecting downstream equipment.

    Protect the equipment from being worn down by impurities, which could damage the asphalt pump, damage the flow meter, clog the spray gun, coil pipe and mold.

    Stabilize production and prevent supply interruption, uneven spraying and product defects due to impurity blockages.

    Improve quality and enhance the purity of the asphalt, especially showing significant effects on modified asphalt, emulsified asphalt, and carbon-based asphalt. 

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    Common Structures and Types

    Basket Filter (Cylinder Filter)

    Vertical cylindrical structure, with stainless steel filter baskets inside

    Easy to disassemble and assemble, large capacity for holding contaminants, most commonly used

    Y-type Filter

    Small in size, low in resistance, mostly used for branch pipes and before pumps for simple filtration

    Double-tube Switching Filter

    Two filter tubes connected in parallel, capable of switching and cleaning without production halt

    Suitable for continuous production lines (mixing stations, modified asphalt, carbon plants)

    Self-cleaning Asphalt Filter

    Automatically scrapes off impurities on the filter screen, no need for manual disassembly and cleaning, suitable for systems with high automation levels.

    Working Characteristics

    Working Temperature: Usually 130 - 200℃.

    Material: Cylinder made of carbon steel, filter screen made of stainless steel.

    It must be equipped with heating/insulation (such as thermal oil, steam or electric heating) to prevent the asphalt from cooling and solidifying and blocking the filter screen.

    Common filtration accuracy: 20 - 80 mesh, selected according to process requirements.

    Typical Installation Locations

    Before the inlet of the asphalt pump.

    Before the metering device.

    Before the spraying system and spray gun.

    At the front end of the modified asphalt and emulsified asphalt production equipment.

    Differences from a Buffer Tank

    Buffer tank: pressure stabilization, heat retention, degassing, temporary storage.

    Filter: specifically removes solid impurities; no pressure stabilization or material storage function.

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