Gap-type filters are classic liquid filters that have proven their worth countless times in diverse applications. Plate, tube, and wire gap-type filters are designed for filtration of heavily contaminated high and low-viscosity liquids, such as fuels, lubricating oils, paints, polyol, isocyanate, cooling lubricants, etc.
Areas of application for gap-type filters
These filters can be used in all industrial fields, such as:
Steam engines and hydraulic motors
Pumps
Hydraulic systems
Machine tools
Gear units
Medium to large combustion engines
Food industry
Processing of polyurethane, insulation materials of all kinds
Solvents, adhesives, and plasticizers
Tar products, flooring, epoxy resin
Purification of water and liquids for chemical processes, etc.
and many more
Gap-type filters can be used in both the main and partial flow. The direction of flow through the filter element is from the outside to the inside and the filter fineness is defined by the gap width. The filter housings are made of steel, cast iron, aluminum, and other materials upon request.
Special features of gap-type filters
These filter types are characterized by the following attributes:
Can be cleaned during operation
Low maintenance
Long service life
Can be used in the main or partial flow
No additional filter aids are necessary
The gap-type filters in our store are characterized by robust designs and unrivaled properties that are the result of decades of manufacturing experience.
Gap-type filter designs
The three variants of gap-type filters – plate gap-type filters, tube gap-type filters, and wire gap-type filters – all function according to the same basic principle, but differ from each other in terms of their design. Here is a brief explanation of the respective modes of operation in the following categories.
As a general rule, maintenance work on gap-type filters should only be carried out by trained personnel.
The maintenance schedule will depend on the application and the dirt concentration, density, and type of dirt.
The higher the dirt concentration and the less favorable the type of dirt, the shorter the maintenance intervals need to be. Whereas with a low dirt concentration and a favorable type of dirt, it may be possible to significantly extend the maintenance intervals.
The customer’s system must be switched off during cleaning and maintenance/repair work. It must be completely depressurized and secured against being inadvertently restarted. The system must not be started with the filter element removed!
Tips on gap-type filter maintenance
To service the filter insert, turn it once or twice using the rotary knob. This causes the gap cleaner or scraper to remove the impurities, which fall into the sludge chamber inside the housing. They can then be drained by unscrewing the plug.
Cleaning is most effective when performed immediately after system shutdown as the freshly scraped-off contaminants will fall easily into the housing’s sludge chamber.
In case of leakage from the stuffing box, loosen its lock nut and tighten the stuffing box screw slightly.
Make sure the knob turns easily, as over-tightening it may damage the gland.
Then re-tighten the lock nut.
If the filter insert is heavily soiled, remove it, soak it in detergent and wash it out.
If the knob does not turn, never use excessive force to turn it.
Filter inserts that are damaged or can no longer be rotated must be replaced.
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