The Accuracy problem of the Hydraulic Cartridge Relief Valve can not be solved in 3 months, AAK solved it with 3 Skills and got Salim out of trouble

China [CN]

The original cartridge valve manufacturer could not improve the cone hole roundness and surface roughness of the hydraulic cartridge relief valve. AAK used 3 skills to ensure that the cone hole roundness of the hydraulic cartridge relief valve was within 0.003, the surface roughness was Ra0.6, and it was linear sealed, without leakage, helping Salim out of the after-sales trouble that has stumped him for in 3 months.

Salim is from Chile. A batch of hydraulic cylinders of their company have been complained by customers that they are unstable. After checking, it was found that the hydraulic cartridge relief valve was leaking, which caused the abnormal operation of the oil cylinder. The root cause was the roundness of the cone hole and the surface roughness. The engineer requires to replace the hydraulic cartridge relief valve, and the cone hole roundness is within 0.005, and the surface roughness is below Ra0.8, which can completely solve the hidden danger. The original manufacturer of the hydraulic cartridge relief valve said that the new requirements is 50% higher than before, but he was willing to try. He made samples twice, but still failed to meet the standard. 3 months passed without any result. The customer was unhappy and Salim was worried.

Salim contacted me under the introduction of AAK's old customer Robert. According to his introduction above, the parameter requirements alone are not a big problem, but the internal structure of the original hydraulic cartridge relief valve should be considered. Our engineer reviewed his drawings and the anatomical drawing of the original hydraulic cartridge relief valve manufacturer, and came up with the plan 2 days later. Salim asked AAK to make samples. After 35 days, AAK sent 12 hydraulic cartridge relief valves. 3 weeks later, Salim emailed that after replacing the hydraulic cartridge relief valve of the original manufacturer, the hydraulic cylinder worked normally.

At the beginning of last month, Salim sent a PO for 240 hydraulic cartridge relief valves. 8 months later, the customer no longer complained about the hydraulic cylinder. His boss was very satisfied with the accuracy of AAK hydraulic cartridge relief valves. The taper hole roundness was within 0.003, the surface roughness was Ra0.6, and it was linear sealed and leak free. All their hydraulic cylinders in stock should be replaced with AAK hydraulic cartridge relief valves. AAK engineers improved the processing technology with 3 skills for the internal structure of the hydraulic cartridge relief valve:

1. The valve seat of the hydraulic cartridge relief valve shall be turned. First, rough holes shall be drilled. The rotation speed of the drill is 1500~1800r/min, and the feed speed is 140~160mm/min. Then, the bottom hole of the thread shall be machined at the bottom of the rough hole. In the middle section of the rough hole, an enlarged hole shall be machined with a boring cutter.

2. Finish the top of the rough hole with a milling cutter to form a tapered hole, and then grind the enlarged hole with an internal and external grinder.

3. Use self-made grinding tools to grind and polish the top of the tapered hole in 2 ways: low speed, fast feed, low speed and slow feed. The coaxiality between the column bar in the middle of the tool and the top cone surface is strictly controlled within the range of 0.003~0.005.

AAK hydraulic cartridge relief valve, there is unique skill to process, you can also try a small order!

https://www.aakindustry.com/info-detail/cartridge-relief-valves-aak419