Coaxiality Failed the hydraulic cartridge needle valve, and AAK replaced the Greek manufacturer

Lewis is from a Greek hydraulic equipment company. At the beginning of the year, their customer had a trial order for 3 wheel loaders and needed hydraulic cartridge needle valves. Lewis chose a hydraulic cartridge needle valve manufacturer in Greek. After using the equipment for 3 months, the customer reported that one of the equipment failed to rise, which should be due to the abnormal hydraulic system. After disassembly, it was found that the spool of the hydraulic cartridge needle valve was stuck in the radial direction, which affected the axial movement of the screw. The root cause was that the coaxiality of the spool and the cage of the hydraulic cartridge needle valve was inconsistent.

From Google, Lewis noticed that AAK had published articles on coaxiality processing and left a message asking: How confident is AAK about a hydraulic cartridge needle valve with 100% consistent coaxiality?

https://www.aakindustry.com/info-detail/hydraulic-cartridge-needle-valves-aak391