For the hydraulic check valve with 3 high requirements used in military industry

Andrea is from a British hydraulic equipment company. At the beginning of last year, they received an inquiry for hydraulic cylinders used in national defense military equipment, which needed to use hydraulic check valves. The specific requirements for the hydraulic check valve are: internal leakage 2drop/min, surface roughness Ra 0.1-0.2μm, concentricity tolerance of valve spool and valve hole is 0.005-0.01mm. These 3 requirements are more than twice as high as the standard parts of hydraulic check valves. Andrea realized the difficulty of purchasing, and contacted more than 10 hydraulic check valve manufacturers online and offline. Except for an old supplier who had cooperated for several years told her that he was 90% confident to meet the requirements, all other manufacturers could not achieve these 3 requirements.

After 45 days, the hydraulic check valve sample was installed on the oil cylinder, and less than 12 hours after commissioning, the hydraulic cylinder was running unstably during reciprocating motion. During disassembly, the engineer found that the hydraulic check valve had internal leakage, which exceeded 2 drops/min, and the concentricity tolerance also exceeded 0.01mm during testing. Andrea was helpless and had to continue to look for new hydraulic check valve manufacturers. More than 1 week had passed, the manufacturer had still not been confirmed yet. Andrea was urged by her boss and got anxious.

Andrea browsed AAK website in Google and felt that AAK could help her. She sent an email to ask about it, and we learned about the purchasing difficulties she encountered. According to the hydraulic check valve drawing and the schematic diagram of the whole hydraulic system provided by her, there are few hydraulic valve manufacturers who can meet the accuracy requirements of this hydraulic check valve. After discussion, our technical team replied to Andrea the next day that AAK was able to develop this hydraulic check valve. The development cost of this hydraulic check valve was at least US$2,000. 2 days later, Andrea directly placed a trial order and paid the development fee.

45 days later, AAK sent 30 samples of hydraulic check valves. 1 month later, Andrea told us that the test run was successful, and the boss was very satisfied that she found AAK,
The success of AAK ultra-high precision hydraulic check valve lies on the following 3 points, which is also why Andrea only found AAK to try this hydraulic check valve.

1. AAK uses a precision honing machine imported from the United States. After honing, the accuracy of the hydraulic check valve hole is IT7 ~ 4, and the surface roughness Ra value can reach 0.1-0.2μm, so as to ensure that the internal leakage reaches the requirement of 2 drops/min.

2. After processing, use the Mahr cylindricity meter imported from Germany to accurately measure each part of the hydraulic check valve through EasyForm software to ensure that the concentricity tolerance of each hydraulic check valve spool and valve hole is less than 0.005mm.