GRAVITY FILTERS
Model HGF
Model DBGF
Model LGF
Model LF (Li'l Fil)

AIR VACUUM FILTERS
Model SCF
Model HVSCF
Model FLA

LIQUID VACUUM 
FILTERS
Model LVF

PRESSURE FILTERS
Model APF

SLUDGE FILTERS
Model SF

ABSORPTION FILTERS
Model ABS

MAGNETIC 
SEPARATORS
Model MSI
Model MSI Video

CENTRIFUGES
Model ACF
Model ASF
Model MCF

EVAPORATORS
Model TEB

VACUUM 
DISTILLATION UNIT
Model VDU
Model VDU Video

OIL-WATER 
SEPARATION
Model OWS
Model DTOS

AUXILIARY
EQUIPMENT
Model SMR
Model SDU

ALUMINUM ROLLING AND DRAWING
Cold Rolling Coolants
Aluminum Wire Drawing

METAL GRINDING
Roll Grinding Coolants
Centerless Grinding
Parts Grinding Coolants

INDUSTRIAL 
WASTEWATER
Spent Coolants
Process Wastewaters

MACHINING
Machining Coolants
Honing Coolants
Gun Drilling Coolants

METAL FINISHING
Alkaline Cleaners
Acid Pickling Solutions
Electroplating Rinsewater

PAINT SLUDGE
Paint Sludge Dewatering

PHOSPHATING
Sodium Phosphate Solns
Iron Phosphate Solutions

STEEL ROLLING
Cold Rolling Coolants
Stainless Steel Rolling Oils

WIRE DRAWING
(NON-FERROUS)
Continuous Cast
Wire Drawing Emulsions
Annealer Quenchants
Spent Emulsion Disposal

WIRE DRAWING
(FERROUS)
Wire Drawing Emulsions
SST Drawing Oils
Annealer Quenchants
Dry Soap Rinsewaters

The Filtertech Model HGF Deep Bed Gravity Filter provides effective clarification for a variety of applications. The Model HGF combines the compact design of a “wheel” type gravity filter with the deep liquid pool feature of our Model DBGF Flat Bed Gravity Filter. This is accomplished by using our patented labyrinth side seal design, which provides an efficient seal along each edge of the filter media. This eliminates the migration of solids around the edge which is a common problem with “wheel” type cylindrical bed filters. The deep liquid pool creates a high pressure differential across the media allowing higher filtration rates and lower filter media consumption.

Mode of Operation

The dirty liquid to be clarified is either pumped or flows by gravity in to the top inlet of the filter. The liquid passes through the low velocity inlet distribution header where it is discharged in to the bed of the filter.

A layer of disposable filter media is positioned within the filter and is supported by a flat wire conveyor belt. As the dirty liquid passes through the filter, solids are removed by the disposable filter media allowing only the clean liquid to pass through, which drains out of the bottom of the filter by gravity.

FIGURE 1

Solids accumulate on the surface of the media to form a filter “cake” which further improves filtrate clarity through depth filtration. The inlet header is submerged in the liquid pool to minimize disturbance of the filter “cake” and foaming of the liquid. The filter also includes Filtertech’s patented labyrinth type positive side seal design which creates a double side seal to prevent migration of solids around the edge of the filter media.

Over time the filter “cake” becomes thicker and more dense such that the filtrate rate through the media decreases causing the level in the liquid pool to rise. This is sensed by a level control float which then automatically indexes the dirty media out of the filter in short increments while also introducing fresh media into the filter. The liquid level drops whereby indexing is stopped, thus providing for completely automatic operation.

For more information request Product Bulletin FT234B or download PDF file.

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