FILTRATION – FLAGSHIP PRODUCT
Automatic Valveless
Gravity Filter
A media filter that backwashes itself on head-loss alone. No pumps, no valves, no controllers, no operator — and no electricity.
THE PRINCIPLE
AUTO VALVELESS
GRAVITY FILTER
The AVGF is a three-chamber gravity filter: filter bed, filtrate collection, and integral backwash storage. Raw water enters by gravity and passes down through the media. Filtrate rises into the backwash storage chamber above.
As the bed loads with solids, head loss rises and the water level in the inlet leg climbs. At a preset level the siphon primes automatically and the stored filtrate reverses through the bed at high rate, flushing it clean. The siphon breaks, and filtration resumes.
No Panel, no pump, no valve, no operator. The filter simply cannot forget to backwash.
OPERATING CYCLE
FOUR STAGES, FULLY AUTOMATIC
TECHNOLOGY COMPARISON
GRAVITY VS. PRESSURE FILTRATION
Both are proven technologies, and each suits different duties. Pressure filters are the right answer where line pressure must be maintained or space is tight. This table sets out where the valveless gravity approach differs, so your engineering team can judge the fit.
| Parameter | Valveless gravity (AVGF) | Pressure filtration |
|---|---|---|
| Backwash initiation | Automatic, on head loss | Timer, DP switch or manual |
| Backwash pump | Not required | Typically required |
| Valves | None | Actuated valve set |
| Control system | Not required | PLC or timer panel |
| Power for filter operation | Not required | Required |
| Routine operator input | Not required | Periodic |
| Moving parts | None | Valves, actuators, pumps |
| Backwash water source | Integral stored filtrate | System or dedicated tank |
| Operating pressure | Gravity head | Pressurised |
| Vessel type | Open tank | Pressure vessel |
| Downstream pressure | Re-pumping needed if required | Line pressure maintained |
| Footprint | Larger plan area | Compact |
| Maintenance scope | Media top-up | Valves, actuators, pumps, media |
| Spares holding | Minimal | Valve and actuator spares |
| Running cost | Minimal | Pump power and maintenance |
SELECTION
SIZING & CONFIGURATION
Stand-alone units cover 10–500 m³/hr. Above that, twin-bed and multi-cell arrangements extend capacity to several thousand m³/hr.
WHERE IT EARNS ITS KEEP
APPLICATIONS
Both are proven technologies, and each suits different duties. Pressure filters are the right answer where line pressure must be maintained or space is tight. This table sets out where the valveless gravity approach differs, so your engineering team can judge the fit.
IN THE FIELD
AVGF INSTALLATIONS
Units in service across refineries, power and steel plants — from single filters to multi-cell banks.
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