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Description
This automatic self-cleaning disc filter combines stacked grooved disc filtration technology with an integrated helical centrifugal design. It uses a stack of precision-grooved plastic discs to create a three-dimensional depth filtration path, which traps organic and inorganic suspended solids within specified micron ranges. The filter operates through pressure differential or time-initiated backwash cycles, with no interruption to main system flow during cleaning. It is designed for commercial procurement and industrial applications in water treatment for irrigation systems.
Technical Parameters
Item No. | Size | Interface Type | Filter Rating (Mesh) | Max Working Pressure | Max Flow Rate | Min Backwash Pressure | Min Backwash Flow |
DFS-2NVH | 2" | Bayonet/Thread | 75/120/150 mesh | 3 Kg/cm² | 20 m³/h | 2.5 Kg/cm² | 8.8 m³/h |
DFS-3NVH | 3" | Bayonet/Thread | 75/120/150 mesh | 3 Kg/cm² | 30 m³/h | 2.5 Kg/cm² | 10 m³/h |
DFS-4NVH | 4" | Bayonet/Thread | 75/120/150 mesh | 3 Kg/cm² | 60 m³/h | 2.5 Kg/cm² | 19 m³/h |
Mesh Size | Micron Equivalent | Typical Application |
75 mesh | -200 micron | Coarse filtration, sprinkler systems, pre-filtration |
120 mesh | -130 micron | Standard drip irrigation, most agricultural applications |
150 mesh | -100 micron | Fine filtration, pressure-compensating drippers, high-risk systems |
Parameter | Specification |
Filtration Technology | Depth filtration through stacked grooved discs |
Cleaning Mechanism | Automatic backwash (pressure differential or time initiated) |
Housing Material | Engineering composite plastic |
Disc Material | Polypropylene/Nylon |
Connection Type | Bayonet/Male thread options |
Minimum Operating Pressure | 2.5 Kg/cm² (for backwash function) |
Maximum Working Pressure | 3 Kg/cm² |
Suitable For | Agricultural irrigation, greenhouse systems, surface water, well water |
Special Feature | Helical centrifugal design for enhanced particle separation |
Item No. | Description | Packaging (Pcs) | Measurement (cm) | G.W (Kgs) |
DFS-2NVH | 2" Automatic disc filter | 1 | Refer to standard dimensions | Contact sales |
DFS-3NVH | 3" Automatic disc filter | 1 | Refer to standard dimensions | Contact sales |
DFS-4NVH | 4" Automatic disc filter | 1 | Refer to standard dimensions | Contact sales |
Custom Option | Details |
Filtration grades | Other mesh sizes (40-400 mesh) available upon request |
Connection types | Threaded (BSP/NPT), bayonet, or flanged options |
Control options | Pressure differential, timer, or manual initiation |
Material options | Alternative engineering plastics for special applications |
Product Features
The filter incorporates a patented helical flow deflector that generates centrifugal force as water enters tangentially. This spinning motion moves heavier particles away from the disc stack, keeping them in suspension. Compared to standard disc filters, this design reduces the frequency of backwash cycles under identical water quality conditions.
Disc filters create multiple layers of filtration paths through grooved disc surfaces, trapping particles throughout the entire disc stack. This design provides higher dirt-holding capacity than surface-only screen filters, particularly for organic contaminants such as algae and plant debris.
The system continuously monitors pressure differential across the disc stack. When preset levels are reached, the backwash cycle initiates automatically. During backwash, the disc stack decompresses and rotates while water flows in reverse, flushing captured particles to drain. Each cycle lasts 10-20 seconds and requires no operator intervention. In multi-unit configurations, only one unit backwashes at a time while others continue operating.
The filter housing is manufactured from engineering composite plastic, which resists corrosion, impact, and UV degradation. Discs are made of polypropylene or nylon, compatible with common irrigation chemicals. This construction maintains structural integrity in agricultural environments.
The filter features a space-efficient design suitable for equipment rooms, pump stations, and field installations with limited space. Multiple units can be configured in parallel to accommodate higher flow rates, matching specific system requirements.
Product Uses
This filter serves as primary or secondary filtration for drip irrigation, sprinkler systems, and micro-irrigation. It is also used in greenhouse and nursery irrigation, surface water filtration from rivers and reservoirs, well water with light sand content (<3 PPM), landscape and golf course irrigation, pre-filtration in agricultural processing, and remote installation sites where manual cleaning is impractical.
Install after the pump and primary pressure regulation, before downstream irrigation equipment. Ensure adequate space for maintenance.
Mount vertically on a stable foundation, following the orientation marked on the housing.
Connect inlet and outlet according to flow direction arrows. Seal threaded connections with PTFE tape.
Connect the backwash drain line to an unrestricted drainage point.
Connect the pressure differential controller and solenoid valves per the wiring diagram.
Slowly pressurize the system and check all connections for leaks.
Normal Filtration: Water enters tangentially, passes through the helical deflector, and flows through the disc stack for filtration.
Backwash Cycle: Initiated automatically when pressure differential reaches preset levels. The disc stack decompresses, and reverse flow flushes particles to drain.
Monthly inspections include checking pressure differential readings, verifying control system operation, ensuring drain lines are clear, and inspecting connections for leaks. Annual maintenance includes inspecting disc stacks for wear, cleaning discs if biological fouling is present, replacing seals and O-rings as needed, and verifying controller and solenoid valve operation.
Problem | Possible Cause | Solution |
Frequent backwashing | Water quality worse than design; Discs damaged or worn | Check pre-filtration; Adjust settings; Inspect and replace disc stack |
High pressure drop | Discs clogged; Flow rate too high | Initiate manual backwash; Reduce flow to rated capacity |
Backwash not initiating | Controller setting incorrect; Solenoid valve failure | Check pressure differential setting; Inspect and clean or replace valve |
Poor backwash cleaning | Backwash pressure too low; Drain line restricted | Verify minimum 2.5 Kg/cm² available; Clear drain line |
FAQ
Disc filters use stacked grooved discs to create three-dimensional depth filtration, trapping particles throughout the disc stack. Screen filters capture particles only on the surface. Disc filters offer higher dirt-holding capacity for organic contaminants.
The helical flow deflector creates centrifugal force that moves heavier particles away from the disc stack, reducing backwash frequency compared to standard disc filters.
In multi-filter configurations, only one filter unit backwashes at a time while others continue operating, ensuring uninterrupted water supply.
The minimum backwash pressure is 2.5 Kg/cm² for all models. System pressure must maintain this level for proper cleaning function.
