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Automatic Self Cleaning Filter Housing

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Automatic Self Cleaning Filter Housing


Food grade DFM DFG series backwashing automatic filter housing


Main model of filter

DFM273 ||         DFM273 III         DFM500       DFM800         DFM1800

Filtering area (m2)

0.32            0.43                   0.82          1.4                 7.5

Volume (L)

72                 85            200           600            6000

Size of inlet and outlet

DN50/80      DN50/80          DN80/200        DN80/300           DN100/500

Size of drain outlet

DN50/80      DN50/80           DN50/80         DN80               DN150

Applicable liquid

High viscosity liquid (< 80.000mPas) impurity mass < 1000ppm)

Filtering precision


Standard design pressure rating

1.0MPa higher can be customized

Design temperature

0-200C (depending on seals)

Cleaning differential pressure

50-100KPa (determined by liquid viscosity)

Differential pressure instrument

Pressure transmitter or differential pressure transmitter

Inlet and outlet connection standard

Flange. HG20592-2009 (standard design) HG20615-2009 (compatible with ANSI B16.5): ON11851 round thread union

Filter element series


Shell wetted material


Scraper material


Shell sealing material

NBR/EPDM/VITON/silicone rubber/FEP coated silicone rubber

Filter element sealing material brigade

NBR/EPDM/VITON/silicone rubber/FEP coated silicone rubber

Piston rod sealing material


Blowdown and slag discharge valve

Full bore pneumatic ball valve

Single acting or double acting 304/316

Utility supply requirements

220V AC 0.4-0.6MPa clean dry compressed air for control system

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Full automatic filtering housing system
Full automatic inner scraper filter housing- DFM / DFG series
DKD, the world's leading manufacturer of self cleaning filter housing, has a full series of scraper type self cleaning filter products, there are three sub series of DFX motor driving external scraper; DFM motor driving internal scraper; DFG pneumatic motor driving internal scraper; which are suitable for different occasions, that can fully meet all kinds of mechanical self cleaning and filtering requirements of industrial customers.

Self cleaning filter housing (DFM motor driving)
Self cleaning filter housing (DFG pneumatic motor driving)

DFM series scraper self cleaning filter housing(DFM filter for short) is a DKD’s independent research and development of late-model high efficiency scraper self cleaning filter housing. Through the mechanical curettage method to automatically clean up the filter element of the inner surface of the particulate impurities, which can realize continuous online filtering. DFM filter housing is mainly designed for high viscosity filter, the applicable viscosity is up to 10000CPS and precision range is 50-1500 microns, precision filtration, which can scrap off the impurity of the filter element fast, so as to remove more impurities efficiently, suitable for high viscosity, fibrous impurity liquid filtering. DFM filter housing follows the DKD high performance, high quality, high reliability design and manufacturing standards, reaching the international first-class quality.

The traditional filter housing filtering the viscous material and soft impurities will be frequently blocked, so it can only choose large filters or frequent manual cleaning, which needs big investment and heavy work, resulting in serious waste of material. DFM filter housing can easily solve this kind of problem with advanced self cleaning method, and always keeps the filter clean, discharge waste liquid containing high concentration of impurities, and reduce material waste; when filtering water and adhesive, resin, polymer, oil and other viscous materials with poor water quality, it has obvious advantages and higher efficiency. With the significant technical advantages and low operating costs, DFM filter gradually replaces the traditional manual filter in many areas, such as vibration screen, bag filter, basket filter, and some back washing type fi lter housing and so on.


Characteristic for DFM DFG series backwashing automatic filter housing

1. Internal and external mirror surface polishing: any stains can be removed by light wiping. Clean and beautiful appearance:

2 Feeding strong magnetic protection: ensure that foreign matters do not damage the equipment:

3. Wedge metal mesh: no secondary pollution, durable, reducing filter consumables and labor costs.

4 Stainless steel flexible scraper: the knife is 100% closely fitted with the screen, with good scraping effect, high permeability of the screen and low internal pressure The production efficiency is improved.

5 Low speed operation: 7~13 rpm operation, no pressure extrusion, no temperature change.

6 Automatic slag removal: monitor the slag content in the sewage collection chamber through the concentration meter to ensure smooth filtration Keep the equipment under normal pressure or slight pressure.

Double spiral shaft: double spiral structure is adopted, which can squeeze the mixed liquor and discharge the dry slag to the maximum extent At the same time, it has the function of positive and negative rotation to reduce the failure rate of slag discharge mechanism.

8 Automatic circulation: When the slag is drained, the slag liquid flows back to the liquid inlet through the circulation system, and then re filters and circulates to realize solid-liquid separation No loss of stock solution.

9 Easy to operate: after setting program parameters according to the actual working conditions of the customer, one key switch is used for automatic operation. If maintenance and cleaning are required The cover opening is convenient and labor-saving, and the slag discharge mechanism is easy to disassemble.


DFM/DFG scraper filter element
DFM/DFG working principle

How is filtering status?
Liquid flows from the inlet, internal spiral flexible scraper 100% attached to the surface of the filter element, liquid flows from inner surface of filter element to outward, and impurities will be trapped in the inner surface and liquid flowing out from the outlet; as time goes on, the impurities are gradually increasing, and the differential pressure is rising, which needs to clean the filter element according to the differential pressure or regularly.

How is the cleaning status?
Motor driving scraper motion cleaning filter element, uses the method of fuzzy control theory to approach the parameters of fluid technology to control the scraper brush cleaning and reasonable emission. It will approximate the filter wear and the loss of liquid flow to the minimum, which is the only filter using this patented invention design (Patent No. 200820033272.2), when helical flexible helical scraper removing filter element, the impurities will produce downward centrifugal force then precipitate to the collecting cavity and was taken away by the scraper. Each cleaning is composed of multiple stroke, after the filter element surface cleaned, the filtration ability is recovered. When cleaning the filter, the flow should not be interrupted.

How is releasing the dirty status?
After some times of cleaning cycles, the impurities accumulate to a certain amount. PLC control program automatically or manually open the sewage valve, discharge of waste liquid containing high concentration of impurities; If necessary, can also be recycle.

Technical features and advantages
1.Screw shaving, especially good at filtering viscous liquid, remove viscous suspension impurities;
2.Structure is simple, easy to disassemble and to remove the filter element, the internal easy to clean;
3.Full automatic operation, continuous online filtering and end heavy filter element replacement and cleaning work;
4.Cost of material and environmental protection, not appear disposable supplies.
5.Equipped with high precision filter element to meet all kinds of filter needs;
6.The filter pressure loss is very small, the flow rate is stable, the energy consumption is saved, and the process is stable;
7.Closed filter to prevent the leakage of hazardous materials, is conducive to safe production and health of employees;
8.The concentration of the waste liquid is high, and the waste can be recycled, and the loss of the high value material is reduced;
9.Optional advanced control systems, powerful, efficient operation, high reliability;
10.Selection of the world's well-known brands of components, high reliability, low operating costs;
11.Standard industrial process control DCS interface, remote observation and control can be achieved;
12.Motor, the pneumatic motor is selected according to the environment.

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