For hydraulic directional control valve with roughness below Ra0.8 and roundness tolerance 1μm, AAK grasps both hands to ensure LEO's peace of mind

China [CN]

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? After communication, it was learned that he encountered the problem of unstable accuracy at the original hydraulic cartridge valve manufacturer. According to the information provided by Leo, this is a valve equivalent to SUN Hydraulics' standard part, but the requirements for this valve cage are higher than that of SUN, in order to compatible with their hydraulic equipment requirements. 

Most hydraulic cartridge valve manufacturers believe that accuracy comes from production, not from inspection, so many of them overlook subsequent inspections. Hydraulic cartridge valve manufacturer AAK focuses on both. We sent Leo a video on how AAK produces and inspects the valve cage of the hydraulic directional control valve. After several rounds of communication, Leo requested AAK to send samples. Yesterday, AAK sent out 6 samples of hydraulic directional control valves for the test order.

From the video, it can be seen that the equipment for producing hydraulic directional control valve cage is TSUGAMI fully automatic lathe from Japan, with the advantage of stable machining accuracy and advanced measurement and control systems. This is AAK's first-hand grasp, and the selection of production equipment is the foundation. How to inspect the valve cage of the hydraulic directional control valve is AAK's second-hand grasp. We use a pneumatic measuring instrument to detect the roughness and roundness of the inner hole, and each hydraulic directional control valve cage is inspected.

AAK hydraulic directional control valve, the quality is controlled with both hands; you can also give it a try!

AAK HYDRAULIC CARTRIDGE VALVES (766) 2024-01-25

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