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This hydraulic valve factory in Guangdong is Charles' old supplier. It has been supplying his company with some conventional hydraulic valves. He had asked the factory whether the surface roughness Ra value of the valve spool could reach below 0.16μm, and the factory said that there was no problem. The proofing was also smooth, then Charles decided to place order with this hydraulic valve factory. Later, it was learned that this hydraulic valve factory could not produce hydraulic valve with Ra value below 0.16μm due to the limitation of its own process equipment and technology. The factory was worried that the customer might walk away, so he accepted the order regardless of his ability. The proofing of this factory's hydraulic valve was outsourced. It was originally agreed that the mass production was also completed by the proofing factory, but the proofing factory rejected the production of the goods finally. Then the hydraulic valve factory arranged mass production in its own factory without authorization, thinking it could muddle through.

We have produced the hydraulic valves with Ra value of valve spool at 0.02 ~ 0.04μm, which can't be done by our peers. Let's take a look at how AAK hydraulic valve makes the valve spool.

AAK proprietary valve spool processing technology: the valve spool generally uses bar material as blank and is processed after normalizing. The process includes: cutting the end face, drilling the center hole, rough turning and fine turning the outer circle, end face and inner hole of countersunk groove, drilling, milling, heat treatment, grinding the center hole, grinding the outer circle, and finishing the outer circle. At the same time, in grinding, high finish grinding is generally used to make the surface roughness Ra value of the workpiece below 0.16μm, some RA values can even reach 0.02 ~ 0.04μm, the roughness value can be nearly 10 times higher than that of peers.