三峡大坝450T、500T门机抓梁移轴液压系统
The 450T and 500T portal hoist axis-shifting hydraulic systems used in the Three-gorge Dam Project.

　　该液压系统为三峡大坝泄洪闸实现与门机联接或脱开的系统。由于它的工作环境为三峡坝区水下120～175米，所以该系统采用了位移传感技术与深水防渗技术以满足在水密性、耐腐蚀性和工作可靠性等各方面的较高要求。它的上位机系统对水下移轴系统进行实时监控。
　　They are used for connecting the sluice of the Three-gorge Dam and the gantry or disconnecting them. As its working condition is underwater 120~175m in the Three-gorges area, it utilizes the displacement technology and deep-water impervious technology to meet the higher requirements in terms of water-tightness, corrosion resistance and operation reliability. Its upper system can implement real-time monitoring of underwater axis-shifting equipment.