Some hydraulic pump manufacturers (the minority) opt for making
barrels entirely of copper alloy (brass), in contrast to a more common
bimetallic design.
Why? Any advantages besides skipping thermal bonding
operation? So far I haven't been able to find a definite final answer.
Just small talk, like the less noticeable thermal expansion deformation
of single metal parts in comparison with bimetallic parts and such...
Is it really that important? Practice shows that both designs work
fine, and, as you can see here, the more material-expensive full-brass
barrel can fail exactly as its wider spread bimetallic brother.
The pics are courtesy of a Liebherr LPVD open circuit pump.
