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

In various metal working operations,
water-soluble coolants and oil are used to remove heat and swarf from the tool and workpiece. Over time, the coolant becomes contaminated resulting in reduced product quality and
tool life and frequent coolant changes.

The Filtertech Liquid Vacuum Filter Model LVF provides effective solids removal through media filtration which is vacuum assisted to minimize media usage and improve filtrate clarity. The filter comes equipped with its own clean and dirty reservoir tanks which minimize floor space requirements.

FIGURE 1

Mode of Operation

Dirty liquid enters the filter through the side inlet header, and is discharged into the dirty compartment. The dirty compartment is separated from the vacuum chamber located below by a filter media barrier through which clean liquid must pass while the solids are retained by the media (see fig. 1). Solids accumulate on the media surface forming a filter “cake” which further improves filtrate clarity by removing finer particulates than would be removed by the media alone.

To promote thicker “cake” formation, an increased pressure differential is created across the filter media by the clean supply pump which takes suction from the vacuum chamber. As the solids accumulate on the surface of the media, the vacuum created in the chamber below increases. When sufficient vacuum has been created, an indexing cycle is initiated in which the vacuum is released by a pneumatic vacuum break, allowing the liquid in the clean tank to be fed into the vacuum chamber during media indexing to ensure uninterrupted flow to the work. The spent media and accumulated solids are removed by the automatic drag chain conveyor and discharged into a collection receptacle for disposal. When indexing is complete, the pneumatic vacuum break is closed and the clean tank is refilled from a side stream of the clean supply line with the excess liquid draining by gravity back to the dirty compartment.

For more information request Product Bulletin FT226 or download PDF file.

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