| Message: | Brishen is from Brazil. He has been purchasing hydraulic valves for 4 years smoothly, but was stumped by a hydraulic cartridge pressure control valve recently. At the end of last year, their customer wanted to customize a hydraulic power unit for the hydraulic system of aviation equipment, which has high requirements for the cartridge pressure control valve. Brishen chose a local manufacturer who has cooperated with their company for 3 years to make samples for the hydraulic cartridge pressure control valve. 2 weeks later, the manufacturer reported that it was too difficult to process this hydraulic cartridge pressure control valve. Especially, the length diameter ratio of the slim hole of the valve spool guide sleeve was 11∶1, and the hole cylindricity was within 2μm, the scrap rate of the sample is 50%, and the processing efficiency is extremely low and it is too difficult to control the cylindricity. Brishen contacted more than 10 cartridge valve manufacturers. No factory was willing to make samples. They either rejected due to small qty or could not overcome the processing difficulty. Brishen was worried. |
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