Authored by: Paul Hazlitt Director of Engineering Cedar Grove,
N.J. Edited by Kenneth J. Korane Key points:  • Changes in
temperature, pressure, or operating conditions can cause
contained fluid to expand. • Expanding fluid can lead to leaks
and damage to sensitive equipment. • Edge-welded metal bellows
compensate for volumetric changes and handle temperature
extremes and rough operating environments.   In many fluid-power
and fluid-handling applications, the gas or liquid inside
equipment and lines can sometimes expand beyond normal design
limits. This can be due to machine operations or caused by the
surrounding environment, such as changes in temperature or
pressure.  Often, expanding fluid leads to trouble. It typically
increases internal pressure which can result in blown seals,
leaks, broken sensors and instrumentation, and premature wear.
The cost of downtime, repairs, and environmental cleanup often
exceeds that of the replacement parts themselves.  To compensate
for fluid expansion, accumulators with