4VISA Catalogue 2021

Baskets
These baskets, manufactured in the UK by Croft Filters, make
up one of the most widely used range of filters used to separate
solids from liquids. With a well-established design, each filter
comprises an assembly of a perforated metal cylinder or cone that
supports one or more layers of very fine wire mesh. To increase
their structural strength, the filters can also be manufactured
with two perforated cylinders with one or more layers of fine wire
mesh sandwiched between them, reducing the open area and so
enabling the filtration of very fine impurities. The filters are inserted
in a hollow body (known as a filter housing) in the path of the fluid
flow, parallel to the flow, forcing the fluid to pass through the filter
media. The size of the wire mesh required depends upon both the
type of fluid to be filtered and the size of the impurities. These types of filters can provide a very
high degree of separation with little change in the pressure drop across them. They must be cleaned
or backwashed to prevent substance build-up – something which would gradually affect the filters’
performance. Please inform us if the filters you require will need to be backwashed or to withstand flow
in both directions.
Cones
Commonly used in a number of industry sectors, these filters can
be manufactured in almost any size and specification, using a wide
variety of materials. Usually placed inline in a fluid stream, they
are generally used for high-velocity fluid flow applications. Their
design includes a perforated cone supporting one or more fine wire
meshes, as per the filtration requirement. Witches’ hat strainers
are the most common type of conical filters used in industry, due to
their well-established design and effective filtration qualities. They
do, however, have a higher-pressure differential across them than
other kinds of filters. The load is also distributed unequally, since
the flow is directed to the central position of the filter. Nonetheless,
the low open areas make these filters very popular for all kinds of
industrial applications – as does the simplicity of design.
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