Hydraulic pressure control valve under high pressure and frequency use, the serv

Payne is from a hydraulic equipment company in the United States. His purchase process has been smooth for 3 years. He did not have much cooperation with AAK, until the purchase of a hydraulic pressure control cartridge valve suffered a loss elsewhere, he trusts AAK more and more. 2 years ago, their company sold tunnel boring machines. Less than half a year after sales, customers complained that the equipment was on strike. The after sales worker found that the contact surface between the hydraulic pressure control cartridge valve spool and the valve cage of the hydraulic system of the equipment had signs of wear. It was judged that the leakage led to insufficient pressure supply for the system, and they went on strike. The original manufacturer of the hydraulic pressure control cartridge valve pushed the buck. He thought that the system pressure of the hydraulic tunnel boring machine was more than 450bar, and the opening and closing frequency of the hydraulic pressure control cartridge valve was high. After half a year of use, it was normal that the valve cage was worn, so only solution was to replace the hydraulic pressure control cartridge valves with new ones. 6 months later after replacement, the same problem occurred again. Payne realized that the hydraulic pressure control cartridge valve of the original manufacturer has a service life of only 6 months. The boss was not satisfied with the after-sales service of the original manufacturer, and asked Payne to re purchase the hydraulic pressure control cartridge valves with a service life of at least 18 months. 2 weeks passed, the no manufacturer was willing to accept the order. Payne was worried.