If the spool is scored, we grind the spool down to get to a good finish. We then build the spool back up with hard chrome. We then use ...

Depends on how the OEM (Original Equipment Manufacturer) designed the valve. Most valves are going to be in the 0.0005" to 0.0002" range. Too lose and too much oil ...

The grooves in the spools help lubricate the spool. When the spool is moved, it grabs a little hydraulic oil in the grooves and distributes a small amount throughout the ...

We're talking about the hard chrome used to repair the spools on control valves and on rods on hydraulic cylinders. Many people are surprized by this answer. Hard ...

No. Spray welding doesn't come close to the tight tolerances (1/7th of the width of a human hair) needed for spools in control valves. Spray welding is a technique ...