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Through Google search, Adrian saw our website . There happened to be an article about the valve block, which mentioned that for the 5 parameters of valve block production, AAK hydraulic valve block is manufactured strictly in accordance with its own 5 processing procedures to ensure at least 7H screw hole machining accuracy requirements; the roughness of mounting hole should be at least Ra0.8; the geometric tolerance is 0.02-0.05MM; the surface roughness of 0-ring groove is at least Ra3.2, and the surface roughness of flow channel is at least Ra12.5. More importantly, the fit clearance error between the hydraulic pressure valve and the valve block produced by AAK can be reduced to 2μm-3μm. This is a standard that many manufacturers can't reach at present.

After reading this article, Adrian immediately emailed us to ask if the hydraulic pressure valve can be leak free. I asked him to send drawings and tell us the difficulties he is facing. Maybe he knew at that time that AAK should be able to help him. After he send us the shipment sample of the hydraulic pressure valve, then we can discuss it later.

After receiving and checking the hydraulic pressure valve samples, we found that most of the parameters of the hydraulic pressure valve passed the test. The biggest problem was that the fit clearance between the valve and the valve block was 8μm-10μm, this was the main reason why the hydraulic oil leaked from time to time. According to his drawings and the working scene of the hydraulic pressure valve, we told him that we could achieve no leakage. If necessary, we could send samples of hydraulic pressure valves within 10 days. Adrian was surprised why we were so confident.

The 5 production processes of AAK Hydraulic valve block: 1) pretreatment - 2) machining - 3) deburring - 4) cleaning - 5) assembly and inspection. We have 5 parameters as hard indexes and 1 feature.