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Types
of Basket Strainers
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| 1 |
Simplex
Basket Strainers |
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| There
are two kinds of basket strainers, simplex and duplex. A simplex basket
strainer is used where the line can be shut down for short periods to clean
or change baskets. It becomes an integral part of the pipeline and all
flow passes through it. |
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| 2 |
Duplex
Basket Strainers |
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| A duplex
basket strainer can operate continuously and never has to be shut down
for cleaning. The most popular and convenient type is, in reality, a specialized
plug valve. A diverter plug is carefully fitted to the strainer body. It
permits flow to pass either left or right. When one basket becomes full,
the flow is shifted to the other one. The dirty basket is then removed,
cleaned and replaced, ready for use again. Another, newer, type of duplex
strainer utilizes a diverter cartridge in place of the diverter plug. This
diverter cartridge diverts the flow through the strainer using balls and
operates like a ball valve. This design's main advantage is that their
is no leakage from one strainer basket chamber to the other. |
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| 3 |
Large
Size Duplex Strainers |
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| A
get larger, however, these types of duplex strainer design
become unwieldy and impractical. In these cases a sliding gate valve arrangement
is used to transfer the flow. The valve discs are actuated by a set of
hand wheels. They are synchronized so when one basket chamber is being
opened to receive the flow, the other basket chamber I being sealed off. |
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| 4 |
Applications |
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| Obviously,
duplex basket strainers are valuable in locations where it is impossible
to shut off flow or stop the operation. Examples are cleaning fuel oil
in large industrial oil burners, for all types of marine applications,
straining water in cooling towers, and straining fluids in continuously
running chemical operations.
Most people
do not realize that a duplex strainer is useful in applications other than
ones which must run continually. Often it is desirable to keep something
going for a few hours only, but during this short time the line must not
shut down. In filling paint cans, for instance, there may be considerable
variations from batch to batch. One lot might have an unusually large amount
of material to be strained and the filling line would have to be stopped
several times if a simplex basket strainer were used. A duplex unit avoids
this. Flow can be switched from one basket to the other, as can fill, and
the line can keep running. |
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| 5 |
An
Important Consideration |
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| An
important feature of a well designed duplex basket strainer is that it
must never allow the flow to stop. If this is possible, a careless workman
can inadvertently do great damage. For instance, the flow of lubricating
oil to a compressor could be shut off while switching from one basket to
the other. With a properly made duplex strainer it should be impossible
to stop the system. If this is required, a separate valve can be used. |
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to Hayward Back to PEP
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Copyright
HAYWARD Industrial Products, Inc. 1999
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Types
of Basket Strainers