SFFILTECH is a brand supplier in dust collector bag house filtration, liquid bag filter filtration, and HVAC filtration systems.

Candle filter housing 1
Candle filter housing 2
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Candle filter housing 1
Candle filter housing 2
Candle filter housing 3

Candle filter housing

Solid-Liquid Separation and Filtration Purification Single-Candle Filter System

Sffiltech helps you achieve process optimization and filtration upgrades.

Sffiltech helps you achieve process optimization and filter upgrades.


Sffiltechis a technology-leading and reliable integrated supplier of filtration system equipment. It has its roots as one of the early domestic manufacturers of filtration equipment. The company was registered in 2006 with a registered capital of 18 million RMB.

Over the years, the company has diligently pursued excellence and used its expertise to provide customers with safe, reliable, applicable, and high-quality equipment from a professional perspective. The company holds more than 30 patents for inventions and utility models and has a professional technical research and development team. Its products have been applied in various industries, including chemical and pharmaceuticals, pesticides, biotechnology, new energy, electrolytes, polyether, iron white, coatings, pigments, food and beverages, automotive painting, and many others.


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    DCF series fully automatic candle-type filtration system

    The DCF series fully automatic candle-type filtration system, also known as filter cake layer filtration system or bundle tube filtration system, is primarily used to automatically capture solid particles from liquids, achieving solid-liquid separation and recovering dry filter cakes.

    This system is independently developed by Sffiltech. It encompasses a complete research and design process, covering major component structures, component installations, control programming, and the application of system automation. The entire system operates with full automation and intelligence, effectively reducing labor costs. It can automatically regenerate filter elements without system shutdown. The system finds wide application in continuous operation and production, high-risk operating environments, high-value filtration material conditions, and situations where standard metal filter cores are not suitable.

    When it comes to your filtration needs, your search is made remarkably straightforward. We offer a comprehensive range of products and services, all meticulously designed to cater to your specific requirements. Our extensive product lineup includes innovative solutions such as Automatic filter housing, Self-cleaning filter housing, and Smart filter housing. You can also explore options like Electronic filter housing, Motorized filter housing, and Programmable filter housing for your advanced filtration needs.

    Our fully automated filter enclosures, known for their self-cleaning capabilities, make maintenance hassle-free. Whether you require an Auto-backwash filter housing, a Sensor-controlled filtration housing, or a Remote control filter unit, our range is equipped to meet the most demanding filtration challenges.

    Our expertise extends to Housing for filter elements, Filter media, and Enclosures for filters, ensuring a wide array of options to suit your unique needs. We provide Filter housing assemblies, Casings for filters, and Housing structures for filtration equipment. As a trusted Filter housing manufacturer, we offer top-quality products, including Filter cartridge housings and Housing for filter bags.

    Discover our comprehensive solutions and products with ease. We're your reliable partner in advanced filtration, making it effortless for you to find the ideal solution for your specific needs, all backed by the convenience of fully automatic systems.


    Application Features

    Fully automatic control with no rotating or moving parts in the main body, making it a static component with dynamic backflushing, resulting in low failure rates.
    Compared to traditional filtration methods, it has lower operating costs and saves a significant amount of labor and time.
    The entire solid-liquid separation process (filtration, washing, drying, and discharging) takes place within a sealed container. This shortens the process flow, reduces the number of processing containers, and eliminates contact between workers and corrosive or volatile materials. This makes the processing safer and more environmentally friendly.
    Effective for handling materials with high impurity content (solid content of 1% to 20%) and high viscosity. It offers high filtration efficiency, achieving sub-micron level filtration (0.1um), resolving issues of traditional filtration and separation equipment (centrifuges, etc.) leaking or incomplete filtration when processing materials with high solid content.
    Achieves true wet and dry separation, ensuring the precision of liquid filtration while automatically discharging solid material in the form of a dry filter cake (with moisture content ≤ 20%). This eliminates the need for secondary treatment required by traditional filters.
    The entire system features automatic cleaning, and the filter elements undergo automatic regeneration, eliminating the need for extensive consumable replacement and handling associated with traditional filtration methods.

    Functional Features

    ● Circulation filtration and clarifying filtration

    ● Recovery and washing of filter cakes

    ● Batch processing with varying volumes

    ● Atomized spray cleaning

    ● Pre-coating and metered addition of filter aids and adsorbents

    ● Material thickening

    ● Zero residual liquid discharge

    ● Material thickening

    ● Fully automatic control for continuous operation

    Product Details

    Filter Cartridge
    The filter cartridge frame of the DCF series fully automatic candle filter system is designed in the shape of a six-petal flower, with top and bottom ports manufactured using molding techniques. It is available in various materials such as stainless steel, PP, PVDF, etc., to accommodate different material conditions. The filter fabric has a smooth transition on the frame, which is beneficial for draining the liquid inside the filter rod, increasing the cartridge's pressure and load-bearing capacity. This aids in automatic drying and cake removal. The unique molding design enhances the consistency and reliability of filter cartridge production while also improving adhesion during cake drying and release during cake removal.
    Operating Principle
    The DCF series fully automatic candle filter system integrates multiple tubular filter elements within a sealed container. These filter elements are covered with specially selected filter cloth based on the characteristics of the filtered liquid. In the case of certain special liquids, filter aids such as activated carbon or diatomaceous earth may be added. When the liquid passes through the filter elements, solid particles are trapped by the filter cloth, gradually forming a "filter cake." Because the gaps between the particles in the filter cake are small, this prevents the escape of particulate impurities from the liquid, resulting in the liquid becoming clear and achieving the desired filtration effect. When the filter cake layer reaches a certain thickness, the filter's filtrate capacity decreases, and filtration efficiency deteriorates. At this point, the filter cake layer needs to be removed, and a new filter cake is constructed to begin a new filtration cycle.
    Lever Module Building upon the candle filter
    Lever Module Building upon the candle filter, we have designed modular components for the piping, instruments, and valves, as well as a complete lever module. This not only reduces lead times but also lowers the on-site construction requirements.
    Filtration State
    The liquid passes through the filter cloth, flows from the outer porous pipes towards the central pipe inside, and then flows towards the top liquid collection outlet. The filter cloth is pressed against the outer surface of the support pipe, and the corrugated support pipe can increase the filtration area and help secure the filter cake, preventing the filter cloth from detaching, thus ensuring stable filtration performance.
    Operating System
    The Sffiltech DCF series candle-type filter systems offer both manual and automatic control modes, as illustrated in the diagram below. Users can employ on-site PLC system control or DCS control for enhanced safety and convenience in equipment operation.
    Inlet: Open the "inlet valve" and start the "material pump." Liquid is injected into the filter chamber. Simultaneously, the "air release valve" at the top of the filter automatically opens to expel air from the filter chamber.
    Once the filter chamber is filled with liquid, the "air release valve" automatically closes, and the "circulation valve" automatically opens. The liquid from the material tank enters the filter through the "inlet valve" and returns to the material tank via the "circulation valve." Circulation filtration begins, and the filter cake gradually forms and thickens on the filter elements.
    When the filter cake reaches a certain thickness and the filtered liquid meets the quality requirements based on automatic detection or sampling, the "circulation valve" automatically closes, and the "clear liquid valve" automatically opens, initiating the formal filtration process. The filtered liquid is then discharged into the "clear liquid tank."
    After all the liquid is drained from the filter chamber, the "discharge valve" is closed, compressed air is introduced through the "positive air inlet valve," and the "clear liquid valve" or "circulation liquid" is opened to discharge the compressed air. Compressed air passing through the filter elements rapidly dries the filter cake.
    Cover Opening for Cake Discharge
    The explanation for opening the air release valve is as follows: After the filter cake has dried, close the "positive air inlet valve," "clear liquid valve," or "circulation valve." Open the "air release valve" to release the pressure in the tank. Then, open the bottom "cake discharge valve" to prepare for cake discharge.
    11 (3)
    Reverse Blowing for Cake Removal
    The explanation for reverse blowing for cake removal is as follows: Open the "reverse blowing valve" to introduce compressed air. The filter bag expands, causing the filter cake to fall off. Then, close the "reverse blowing valve," and the filter bag contracts. This process is repeated multiple times to repeatedly expand and contract the filter cloth on the filter elements, allowing the filter cake to fall off rapidly.
    12 (2)
    After cake discharge, close the "cake discharge valve," open the "cleaning valve," introduce cleaning fluid, and open the "drain valve" to discharge the cleaning fluid. The filter cloth is restored by the repeated flushing with cleaning fluid, restoring filtration efficiency. (Different cleaning fluids and cleaning methods can be selected based on the chemical properties of the material.)
    13 (2)
    Backwashing State
    Reverse airflow is introduced, flowing from the central non-porous pipe to the external porous pipes. The filter cloth expands and becomes round, effectively shaking off and detaching the filter cake. Simultaneously, it can remove particles from the filter cloth fibers, improving the efficiency of the backwashing process and rapidly restoring the filter cloth's filtration capacity. Main Components - Actual Images, Stainless Steel Filter Cartridge Frame, Stainless Steel Filter Cartridge Frame, Awaiting Installation Plastic Filter Cartridge Frame, Plastic Filter Cartridge Frame, Awaiting Installation Images of Filter Cloth and Filter Cartridge, Installation with Different Diameters of Stainless Steel Filter Cartridge Frames, Internal Collector Pipe in the Filter, PVDF Clamp, PEEK Bolt, Seamless Filter Cloth.
    14 (3)
    Pressure Filtration and Residue Discharge
    When the flow rate measured by the "clear liquid flow meter" falls below a certain value, indicating that the filter needs cake removal, the "positive air inlet valve" automatically opens, and the "inlet valve" automatically closes to drain the remaining liquid from the filter chamber. Once all the liquid that is at the same level as the filter elements in the filter chamber is drained, the "discharge valve" is opened, allowing the residual liquid at the bottom of the filter chamber, which couldn't filter out, to be discharged via the "retained liquid valve." If process requirements prohibit returning the residual liquid to the material tank, the "discharge valve" is not opened. Instead, the "residual liquid pump" is activated to pump the residual liquid to the "residual liquid spray nozzle," where it is sprayed into the filter. Compressed air introduced through the "positive air inlet valve" filters the sprayed residual liquid into the "clear liquid tank." The "residual liquid flow meter" automatically closes when no residual liquid is detected in the chamber, indicating the completion of the residue removal process.


    These typical applications showcase the versatility and multifunctionality of the DCF series fully automatic candle filter system, suitable for various industrial filtration needs across different fields. Here is a brief description of some of the applications:

    ① Filtration of decolorizing activated carbon - Purification of copper foil production prior to copper sulfate electrolysis: Used to remove color and impurities for the purification of solutions before copper sulfate electrolysis in copper foil production.

    ② Catalyst recovery and filtration - Purification and washing of pigment products: Employed for catalyst recovery to purify and wash pigment products.

    ③ Filtration of additives in lithium battery electrolyte - Regeneration of dye intermediates and purification of treatment solutions: Used to filter additives in lithium battery electrolyte and regenerate dye intermediates while purifying treatment solutions.

    ④ Saltwater refining and precoating filtration system - Glyphosate recovery, recovery of agricultural chemical catalysts, and removal of post-decolorization activated carbon: Applied for glyphosate recovery, recovery of agricultural chemical catalysts, and removal of residual activated carbon.

    ⑤ Epoxy resin saltwater filtration - Purification of lactose syrup before crystallization: Used for saltwater filtration in epoxy resin production and purification of lactose syrup before crystallization.

    ⑥ Inorganic salt production - Recovery of residual vegetable oil residue, activated clay, activated carbon, and hydrogenation catalysts: Employed in the production of inorganic salts for the recovery of residual vegetable oil residue, activated clay, activated carbon, and hydrogenation catalysts.Plasticizer removal of alkaline salts - Removal of alkaline salts in antibiotics, vitamins, active carbon purification, crystal purification, and washing: Used for the removal of alkaline salts in plasticizers and for active carbon purification, crystal purification, and washing in the production of antibiotics and vitamins.

    ⑦ FCC filtration in flue gas desulfurization - Recovery of precious metal catalysts and Raney nickel: Employed for FCC filtration in flue gas desulfurization to recover precious metal catalysts and Raney nickel.

    ⑧ Filtration of lactic acid with calcium sulfate - Filtration of dyestuff residue water and wool washing water in viscose fibers: Used for the filtration of lactic acid with calcium sulfate and filtration of dyestuff residue water and wool washing water in viscose fibers.

    ⑨ Filtration of adsorbents in PLA (polylactic acid) - Desalination and particle recovery in PPS, PTA, PVC: Applied for filtration of adsorbents in PLA and for desalination and particle recovery in PPS, PTA, and PVC.

    ⑩ Filtration of low polymers in PGA (polyglycolic acid) - Treatment of pharmaceutical and chemical wastewater, cooling water recycling: Used for the filtration of low polymers in PGA and for the treatment of pharmaceutical and chemical wastewater, as well as cooling water recycling.

    ⑪ Filtration of titanium dioxide (TiO2) slurry and first and second wash - Recovery of solids after centrifugation: Employed for filtration of titanium dioxide (TiO2) slurry and first and second wash processes to recover solids following centrifugation.

    ⑫ Polymer dissolution and purification and catalyst removal - Production of ethylene glycol: Used for the dissolution and purification of polymers, removal of catalysts, and production of ethylene glycol.

    ⑬ Catalyst recovery and filtration in TDA hydrogenation - Ethylene production process: Employed for the recovery of catalysts in TDA hydrogenation and filtration in the ethylene production process.

    ⑭ Filtration for decolorization after biological extraction and enzymatic digestion - Filtration after enzymatic digestion of collagen peptides: Used for decolorization filtration after biological extraction and enzymatic digestion, such as in the production of collagen peptides.

    Filtration for decolorization after biological extraction and enzymatic digestion - Filtration after enzymatic digestion of collagen peptides: Used for decolorization filtration after biological extraction and enzymatic digestion, such as in the production of collagen peptides.

    Product Details

    Here are some engineering application cases:
    Regeneration of Rigid Polyether Foam for Desalination
    Application: Regeneration of rigid polyether foam with desalination.
    Lubricating Oil Filtration Project at a Petrochemical Company in Chongqing:
    Application: Filtration of lubricating oil at a petrochemical company in Chongqing.
    Lithium Battery New Materials Project:
    Application: Utilized in a project related to new materials for lithium batteries.
    Photoresist Project:
    Application: Applied in a photoresist project.
    TDIA Filtration, Washing, Extraction, and Thickening:
    Application: Used in TDIA (TDA) processes for filtration, washing, extraction, and thickening.
    These engineering application cases demonstrate the versatility of the DCF series fully automatic candle filter system in various industrial applications.
    Here are additional engineering application cases from the eighth page:
    (1) Application: Iron powder filtration in an electromagnetic project.
    (2) Application: Applied in a hazardous chemical project.
    (3) Application: Used for filtration of oil products at a cooking oil factory.
    (4) Application: Filtration of animal protein at a biopeptide factory.
    (5) Application: Iron powder filtration in another electromagnetic project.
    (6) Application: Applied in another hazardous chemical project.
    (7) Application: Filtration of titanium dioxide in a titanium industry group.
    (8) Application: Used in a project for the refinement and decolorization of Vitamin C.
    (9) Application: Filtration of oligomers in a Polyethylene Glycol (PGA) project.
    (10) Application: Pre-coating filtration for C9 hydrogenated resin at a petrochemical company in Xinjiang.
    These additional cases showcase the diverse range of applications where the DCF series fully automatic candle filter system can be employed.

    Iron Sulfate Filtration

    Silica Gel Decolorization and Adsorption Filtration in VE Oil Production

    Hydrogenated White Oil Filtration at a Pharmaceutical Factory

    Crude Liquid

    Filter Cake

    Clear Liquid

    Crude Liquid in Pesticide Intermediates

    Filter Cake in Pesticide Intermediates

    Clear Liquid in Pesticide Intermediates

    Filtration and Decolorization of Succinic Acid

    Filtration of Fermentation Broth Microbial Corpses

    Collagen Peptide from Bovine Hide

    Filtration, Drying, and Washing of Decolorization with Activated Carbon in Collagen Peptide

    Spare Parts and Components

    We offer timely after-sales service and technical support, providing customized spare parts and components to meet various process requirements for our customers.

    Comparison with Fully Enclosed Plate Filter (Vertical Leaf Filter)

    Filter Element Form   


    Full Enclosed Plate Type (Vertical Blade Filtration)

    Operating Mode: Automation Level

    Fully automatic operation with low manual labor.

    Vertical Leaf Filter: Falls between plate and frame and candle filters in terms of automation.

    Operating mode

    Closed operation

    Closed operation

    Filter Element Form

    6+1-style integrated petal structure, with a filtration pressure regulation device to ensure strong filtration element, high flux, uniform filter cake, and stable filtration efficiency. Filtration elements are available in various materials, both metallic and non-metallic, offering corrosion resistance and long service life, reducing the cost of spare parts.

    Rectangular metal mesh support structures make filter cloth installation complicated and equipment maintenance difficult, and the plate-like support structure leads to uneven pre-coating, affecting filtration performance.

    Uniformity of Pre-coating:

    Single filter elements have a smaller area, with a cylindrical and radial structure. The filtration pressure regulation device ensures a very uniform pre-coating.

    Single blade filters have a larger area with a rectangular plate-like structure. The lack of flow rate adjustment devices results in uneven pre-coating.

    Filter Cloth Attachment to Support:

    Special tightening mechanisms at both ends ensure no leakage and facilitate easy installation and disassembly.

    In contrast, installation and disassembly are inconvenient in the case of the other filter type, which can lead to potential leakage issues.

    Filter Cloth Regeneration:

    The filter cloth can be regenerated using various solutions such as gas, clean water, acid, or alkali through methods like backwashing, forward washing, or scrubbing, depending on the requirements. After regeneration, the flux remains unaffected, and the frequency of filter cloth replacement is low.

    In contrast, for vibrating-cake filter cloth regeneration, it can be backwashed with gas or cleaning liquid, but it lacks a filter element pressure regulation system. This can lead to gas short-circuiting, less effective backwashing, increased complexity in cleaning, and an intermediate filter cloth regeneration effect, resulting in a higher frequency of filter cloth replacement compared to plate and frame and candle filters.

    Production Efficiency:

    The filter elements come in various specifications, such as 1.6M, 2M, 2.5M, 2.7M, etc. They offer a high number of filter cores per unit volume, resulting in a large filtration area. This, in turn, leads to long filtration cycles. After the filtration cycle, the discharge and cleaning processes are relatively short, allowing for a quick transition to the next filtration cycle. This design contributes to high production efficiency.

    In contrast, the blade-supported mesh plates have larger individual areas but a lower quantity of filter elements, resulting in a smaller filtration area. After the filtration cycle, discharging and cleaning processes take longer, and the production efficiency falls between that of plate and frame filters and candle filters.

    Utilities Consumption:

    Low water consumption

    High water consumption

    Equipment Lifespan:

    No moving parts, long equipment lifespan, up to 15 years

    Vibration cake discharging method

    Can damage the equipment, leading to a shorter equipment lifespan


    Small footprint

    Relatively large footprint

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    Shanghai Sffiltech Co., Ltd. is one of the leading & professional companies on the dust filtration & separation products in China
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    Factory address: 3#201, No.3255 Shengang Road, Songjiang District, Shanghai

    Contact person: Amily Li
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