For the hydraulic relief valves with an angle error of 0.06 °, AAK innovated the processing of inner cone 3 years ago

China [CN]

Fischer comes from a Spanish hydraulic equipment manufacturing company and is an experienced purchaser. Unexpectedly, the hydraulic pilot operated relief valves purchased last year made him depressed for more than 1 month. In August last year, the sales of one of their hydraulic power units was not satisfactory, and there were several complaints about unstable supply and pressure. The problem is that the angle error of the inner cone of the hydraulic pilot operated relief valve is large. The original manufacturer of the hydraulic pilot operated relief valves advised that this is an individual problem. But after replacement with new one, there are more and more complaints. The boss was very angry and requested Fischer to purchase a new batch of hydraulic pilot operated relief valves for replacement within 45 days. Fischer contacted with many hydraulic cartridge valve manufacturers and required that the angle error range of the cone inside the sleeve of the hydraulic pilot operated relief valves must be 100% controlled within ± 0.08 °. However, 1 week has passed and no one of these hydraulic valve manufacturers is willing to accept the order. Fischer was depressed and worried.

Introduced by his friend Trinidad, an old customer of AAK, Fischer sent me an e-mail. According to his drawings of hydraulic pilot operated relief valve, as long as the angle error of the conical surface in the valve sleeve is solved, the unstable pressure supply of the hydraulic power unit can be solved. 1 month later, AAK sent 100 hydraulic pilot operated relief valves.

Last week, Fischer informed by email that since AAK hydraulic pilot operated relief valves were used, there was no complaint about unstable pressure supply. Their engineers specially tested the internal cone angle of the hydraulic relief valves, which was 25% higher than their accuracy requirements and 100% controlled within 0.06°. Fischer was curious that the internal cone angle error of 0.06° could not be solved by many hydraulic valve manufacturers, but AAK exceeded the standard for 25%.

As early as 3 years ago, AAK engineers innovated the precision machining of valve body. First, they established a manufacturing error model to control the error range of the angle of the inner cone below 0.06° and the maximum axial grinding tolerance of the corresponding sealing circle below 2μm. At the same time, a special detection device is innovated to improve the detection accuracy through error correction and ensure the stability of grinding manufacturing accuracy. The inner conical surface of the hydraulic pilot operated relief valve sleeve adopts the finishing process of carbonitriding and post grinding to accurately control the grinding amount. The key is to control the grinding amount. If the grinding amount of the inner cone surface is too large, it will result in the reduction of hardness, and the service life of the hydraulic pilot operated relief valve will be reduced, which leads to unstable pressure supply.

AAK hydraulic pilot operated relief valves, strictly control the details, high accuracy, you can also try a small order!

https://www.aakindustry.com/info-detail/hydraulic-pilot-operated-relief-valves-aak316