AAK Hydraulic Cartridge Valve Cage Roughness and Roundness Control

Leo is a purchaser of a hydraulic equipment company in the United States. He has been purchasing hydraulic cartridge valves from China for 2 years and has been very smooth. However, in recent 2 weeks, he had a big headache due to the cage accuracy of a hydraulic directional control valve purchased from a hydraulic cartridge valve manufacturer in China. Some of the valve cages did not meet the roughness and roundness accuracy standards, which angered his engineer. The engineer requires that the Ra value of each hydraulic directional control valve cage be below 0.8 and the roundness tolerance be within 1μm.

Leo found hydraulic cartridge valve manufacturer AAK on Google and sent an email asking if it is possible for AAK to ensure that the valve cage of each hydraulic directional control valve is Ra0.8 or less, and the roundness tolerance is within 1μm?

https://www.aakindustry.com/info-detail/directional-control-valves-aak766