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Some Distinctions of
Single Act Compressors
The single-acting compressor is
distinctive from other types of compressors due to its piston, which are
similar to those on the automobile. The piston is pushed through a
connecting rod from the crankshaft. With each rotation of the
crankshaft, compression takes place on the top portion of the piston.
These types of single-acting, reciprocating air compressors may be
either air-cooled or liquid-cooled, but are usually air cooled.
The air-cooled, reciprocating air compressor is the most common type of
air compressor in both the fractional and single-digit hp size
categories. The larger air compressors are available up to 150 hp,
although those above 25 hp are not very common.
Reciprocating air compressors utilize two types of capacity control. The
easiest form is the star-stop method, which turns off the compressor as
a pressure switch transmits a signal to the main motor starter when a
preset pressure is reached. As the pressure falls to another preset
pressure, the switch transmits a signal to restart the compressor. In
order to avoid constant starting and stopping, an air receiver becomes a
type of buffer.
Multi-stage and two-stage types of air compressors are available in
durable and efficient models. These particular models contain
inter-stage cooling which will decrease discharge which, in turn, will
result in better efficiency and durability.
There are many benefits of single-acting reciprocating air compressors.
Some of these benefits include: they are easy to maintain; they are
small and light weight; they may be positioned near the area in which
they are used; and they do not need separate cooling systems.
On the other hand, there are disadvantages with these types of air
compressors such as the rather high cost of compression and they are
normally designed to operate less than 50% of the time.
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