| Message: | A while ago, Basel from Spain left a message on the website of hydraulic cartridge valve manufacturer AAK: Can you GUARANTEE that the cylindricity of the cage of the hydraulic cartridge valve is controlled within 0.3µm, and the accuracy of within 2μm? With the word“GUARANTEE” capitalized, I can feel Basel's emotions, he should have received promises from other hydraulic cartridge valve manufacturers, but he has been hurt.
After communication, it was learned that Basel had tested the samples from a hydraulic cartridge valve manufacturer in Ningbo China. The 6 testing samples passed the requirements of 0.3µm cylindricity and 2μm accuracy for the valve cage. However, the 480 pcs of shipment had accuracy issue. That is to say, the machining accuracy of the original hydraulic cartridge valve manufacturer is unstable. For hydraulic cartridge valve cages with high precision requirements, subsequent honing is crucial. The consistent thinking of hydraulic cartridge valve manufacturer AAK is a 3-step process: what has been done, why is this done, and what else needs to be done?
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