David, who is very picky with the cylindricity accuracy of Hydraulic Cartridge Directional Valves, has been convinced by AAK with 2μm accuracy

China [CN]

David from Israel collaborated with hydraulic cartridge valve manufacturers in China since 2018. AAK has supplied him with several hydraulic cartridge proportional valves that are equivalent to HydraForce standard parts, and it has always been very smooth. In May of this year, a hydraulic cartridge directional valve with high requirements for cylindricity made him very upset.

This hydraulic cartridge directional valve is used in hydraulic systems for navigation, with high accuracy requirements, especially the cylindricity accuracy cannot exceed 3μm. David disliked the high price of AAK, and chose another hydraulic cartridge directional valve manufacturer in Ningbo China. Later, I learned that it was just 12% higher. I told David that there are no more than 3 manufacturers in Ningbo that have this program, but not every manufacturer can control the cylindricity of each hydraulic cartridge directional valve cylindricity accuracy within 3μm.

Last week, David emailed me to check if AAK can control the cylindricity accuracy of each hydraulic cartridge directional valve within 3μm. After communication, it was learned that his procurement from the other hydraulic cartridge directional valve manufacturer was not smooth. The cylindricity of the manufacturer's hydraulic cartridge directional valve hole is unstable, although most of the accuracy can be within 3μm, those unqualified hydraulic cartridge directional valves, which are not sensitive to opening and closing, have affected the entire hydraulic system. Their engineers require that the accuracy of each hydraulic cartridge directional valve hole be controlled within 3μm. The manufacturer requested a 30% increase in price because the 30% of unqualified hydraulic cartridge directional valves will be wasted. 

I told David that whether the cylindricity accuracy of the hydraulic cartridge directional valve hole is stable or not depends on the machining. But each one needs to meet accuracy of within 3μm, the key lies in 100% detection, and a high sensitivity cylindricity measuring instrument is required. AAK can control the cylindricity accuracy of each hydraulic cartridge directional valve hole to be 2μm, which is higher than 3μm accuracy that he requested.

The detection of the cylindricity accuracy of the hydraulic cartridge directional valve hole is carried out by AAK using the Japanese Mitutoyo measuring instrument and connected to the roundness analysis software. The measurement data and graphics can be summarized and analyzed first, and then the detection results can be obtained. Especially, the Z-axis comes with a digital ruler, with a rotation accuracy of up to (0.04+6H/10000) μm. Equipped with DAT function (digital adjustment function), it avoids errors in adjusting the instrument manually and ensures timely screening of each substandard valve hole cylindricity. Most hydraulic cartridge valve manufacturers in China do not use this testing instrument and may not conduct 100% full inspection. 

AAK hydraulic cartridge directional valve, valve hole cylindricity accuracy, not only in processing, but also in testing, you can also give it a try!

AAK HYDRAULIC CARTRIDGE VALVES (650) 2023-08-15

https://www.aakindustry.com/info-detail/cartridge-directional-valves-aak650