AAK Hydraulic Cartridge Directional Valve Cylindricity Accuracy 2μm

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

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