Type vma

Compressed-air treatment for the most critical requirements

Cleaning of compressed air with standard filters is insufficient for many applications. For cases of this kind, the filter system V-M-A, available as single units or combinations, offers a wide range of filters to meet all requirements, from technical-clean air working equipment via process air to odour-free air for breathing.

Housing assembled from V-M-A modular system for direct flange mounting with sizes I and II. Two sizes
of housing and 6 different sizes of filter element. Connecting threads from G¼ to G2 in
accordance with DIN-ISO 228. Housings and bowls are made of aluminium, plastic-coated or anodised, protected against corrosion, attractive appearance, easy to clean.

Differential pressure gauges. Indicates the pressure drop in filters. We recommend that the filter element is changed when the pressure drop exceeds 0,6 bar (red zone). Full exploitation of service life of filter saves money-timely replacement stops wastage of energy. Gauges can be fitted as desired to be readable from front or rear (double scale).

Kit for bracket mounting of single units and combinations available as an accessory.

Filter elements. For every size of filter-three different elements of identical dimensions.

Fully automatic drain valve. Fitted as standard to pre-filters and micro-filters. Mounted outboard, easily accessible for maintenance. Minimum operating pressure 4 bar.

Manually-operated drain valve. Fitted as standard in the form of a drain screw in the case of activated charcoal-filters, since these are not subject to condensation.

Single units

Pre-filters, Micro-filters, Activated-charcoal-filters
The structure of the V-M-A range as regards individual sizes and connecting threads is as follows: Two different sizes of housing are available with two or four different bowl lengths, which makes a total of 6 different nominal sizes or element sizes. For each size, two different connection threads are available (even three for the smallest sizes), thus making a total of 13 different versions of each single unit or combination.

Combinations

Pre-filter – micro-filter
Micro-filter – activated-charcoal-filter
Pre-filter – micro-filter – activated-charcoal-filter

Combinations are assembled from single units in the case of sizes I and II by simple flangemounting, using four tapered sleeves with screws and nuts. The working sequence for flange mounting is as follows:

1. Lay the first unit on the table, with the flange face uppermost.
2. Insert the sealing ring and four nuts into the appropriate recesses.
3. Position the next unit with its flange face downwards.
4. Fit the tapered sleeves one at a time and tighten the screws lightly.
5. Fully tighten the screws, working crosswise.

Operation: As a protection of the differential pressure gauge the unit must be charged slowly with pressure after assembly, so that a pressure equalization persists.

Filter elements

The three different filter elements available for each size of filter have identical dimensions:
V Pre-filter element – sintered Polyethylen, chiefly for filtering of solid matter.
M Micro-filter element – borosilicate glass microfiber, chiefly to remove aerosols.
A Activated-charcoal-filter element – for adsorption of oil vapours.

Since the flow direction with pre-filters and micro-filters or activated-charcoal-filters is different, attention must be paid to this when changing filter elements or reassembling filters. The service life of filters up to the recommended time for replacement (when the pressure drop reaches 0,6 bar) is about 2000 hours of operation, depending on the incidence of contamination. We recommend a flow rate of between 10% and 80% of the specified nominal values.