Abstract: During the durability testing of the loader hydraulic flow amplification valve, a persistent issue of excessively high impact pressure was observed. To address this problem, an in-depth analysis was conducted based on the system's working principles. The investigation revealed that the median pressure holding phenomenon of the shuttle valve commonly occurs during load pressure selection. Firstly, the shock waveform curve of the durability fault of the original flow amplification valve is given. Two innovative solutions are proposed: one is to integrate the constant flow valve into the main valve body, and the second is to obtain LS pressure from the main stem. The experimental verification of the integrated constant flow valve scheme was emphasized. The shock waveform curve of the endurance test at 1 Hz frequency was successfully obtained. The results show that the two solutions can effectively eliminate the problem of median pressure holding of the main valve LS, and successfully solve the technical problem of continuous high pressure of the main pump during the durability test. This scheme has a good improvement effect on cushioning steering impact. The solution proposed in this study provides a new idea for the product design and development of flow amplification valve, and has important theoretical guiding significance for the debugging of loader steering performance.