Automatic Disc Filter, Backwash Unit Disc Filter

They are wildly used in irrigation filter, drip filter, water filter, reused water filter, circulation water filter, cooling wat

Color-coded polypropylene or Nylon discs are grooved on both sides to a specific micron size. A series of these discs are then stacked and compressed on a specially designed spine. When stacked, the groove on top runs opposite to the groove below, creating a filtration element with a statistically significant series of intersecting grooves which trap the solids. The stack is enclosed in corrosion and pressure resistant housing.

During filtration, the discs are tightly compressed together by a combination of the spring's power and the differential pressure,

Thus providing high filtration efficiency. Filtration occurs while water is percolating from the outer diameter to the inner diameter of the element. Depending on the micron rating (See table), there are from 18 (in 400 micron discs) to 32 (in 20 micron discs) stopping points in each track, thus creating the unique in-depth filtration (Figure below).

Table of Filtration Grades of the Discs and Color Code
Color Code	Blue	Yellow	Red	Black	Brown	Green	Purple	Gray
Micron	400	200	130	100	70	55	40	20
Mesh	40	80	120	140
Material	Nylon/PP

The discs are stacked on the filter’s spine. The discs are color-coded by micron size, and are assembled according to your water filtration requirements. The spine assembly has a spring compression unit and an internal piston which operate during alternate filtering or backwashing modes.

The spine assembly is specially designed to compress the micron-grooved discs inside a corrosion and pressure resistant housing. Inside the housing, a spring and the pressure difference compress the discs tightly during the filtration process, forcing the water to flow between the grooves and traps of the stacked discs.

Automatic Backflush Operation:

Activated by a pre-defined command (differential pressure or time) alternate units of the system go into backwash operation. The inlet valve is shut as the drain is automatically opened.

During the backwash process, the compression spring is released and the pressure difference is eliminated. The spine piston climbs up, releasing the pressure on the discs. Tangential jets of clean water are hydraulically pumped at high pressure in the opposite direction through nozzles at the center of the spine. The discs spin free and clear, loosening the trapped solids. Solids are quickly and efficiently flushed out through the drain.

Disc Filtration Unit

Fil-tech supply 2inch, 3inch, 4inch, 6inch and 12inch disc filters.

Filter Unit	2 inch	3 inch	4 inch	12 inch
Inlet & Outlet  Diameter	2inch	3inch	4inch	12inch
Spine Quantity	1	2	5	51

 

 

 

Main Technical Data

 

Filter Unit	2 inch	3 inch	4 inch	12 inch
Spine Quantity	1	2	5	51
Outer Shell Material	Nylon PP	Nylon PP	316 Stainless Steel Special Polymer	316 Stainless Steel Carbon Steel
Max. Pressure Bar	10	10	10	10
Disc Material	PP/Nylon
Filtration surface cm2	880	1760	4400	44880
Max. Flow Rate T/H	20	30	100	750
Inlet & Outlet Size	2inch, clamp	3inch, clamp	4inch, clamp	12inch, flange connection
Outside Diameter	490x290x200	865x320x200	605x514x450	1196x1196x1238
Wight KG	6	14	40	450

Note: Special polymer can bear almost all water corrosion; All materials are through the American FDA approval can be used in food and medicine related water process system. PP disc has excellent corrosion resistant ability; nylon disc has better pollution resistance ability.

Advantage of Filtering System

Advantage	Characteristic
Constant filtering efficiency	As core element of filter, the uniformity of groove style filtering superposition piece reaches to international first rate standard. The filter is in effect for all kinds of suspension impurity including inorganic and organic impurity.
High efficiency backwash, energy and water saving	The unit of backwash will be finished for 7-20 sec only. In general the amount of consumed water in backwash is less than 0.5% of amount of filtering water. For viscosity impurity, high effective washing also be reached. The suitable scope is wider.
Full automatic control, flow continuously	The filtering and backwash may be carried out at the same time. The loss of pressure and flow rate produced by automatic maintenance of system is less. The backwash is carried out in turn one by one and the others work normally.
Low cost, reliable and long service life System	The system has been identified through IS9002 international quality system. And all the products are tested overall before sold. It's almost without daily maintenance, installation and convenient operation, reliability transportation.

Filtration System's Application

Application	Description	Function	Industry
Cooling circulating water treatment	Cooling water equipment, instruments and products cooling water	It can solve the block problem effectively and reduces energy consumption and dosing amount too and prevent from stopping caused by trouble and reduce the expense of system maintenance.	Steel and iron, power plant, petrochemical, plastic, running water primary filtration, machinery, etc
Membrane water treatment	Membrane system protection	The purpose of protecting precision element of filter and prolonging its life can be reached.	Water treatment
Water treatment	Spraying water treatment, protection granulated substance ponders, filter element, filter pocket, ion-exchange reactor, etc.	Save total amount of water to be used and improve the quality of water and reduce or avoid sewage discharging directly to lead environmental pollution.	Electric power, chemical, automotive, paper-making and other industries
Seawater filtration	Pre-treatment of seawater desalt	Remove impurity and ocean microorganism in seawater. The property of salt resistant and anticorrosion of plastic filter is better than metallic filter with expensive cost. And prolong its lift.	Water treatment
Other chemical fluid	Solvent, emulsion, etc.	Meet the production requirements. Protect equipments.	All industries
Drip irrigation filtration	Cotton, fruit trees drip irrigation filter	Protect drip outlet	Large areas of crops land

Automatic Disc Filter, Backwash Unit Disc Filter