What are the Grooves in the Spools?

Refinished spools off hydreco control valveMerry Christmas!  We've had a few questions about what the grooves are in the spools.  These grooves trap oil and keep the spool lubricated.  They serve an important function in keeping your valve and machine operating smoothly.

When your spools are refinished, we replace these grooves and any inlets on the edge of the spools.

Closeup of grooves cut back into a refinished hydraulic spool.In the pictures to the left, you can see spools that have been rechormed and grinded to like new tolereances of 0.0004".  You can see a closeup of where the grooves have been cut back in to the spool to capture oil and keep everything lubricated.  Just like when it was new.