The method to deal with the blockage of the seven-joint valve of the tunnel boring machine is as follows:
1. The control channel is blocked by debris (the channel is small and easy to block), and the piston is stuck in the highest position due to rust. Although the upper part is stressed, it cannot move downward and the main channel cannot be opened. Therefore, a filter must be installed in front of some valves that contain more impurities in the fluid. For newly installed or long-term decommissioned pressure reducing valves, they must be disassembled. Start inspection, cleaning and pressure test.
2. Flange leakage. The flange seal of the valve mainly uses gaskets to achieve sufficient sealing specific pressure to prevent the leakage of the sealed pressure fluid medium. Corresponding new technological means must be adopted to eliminate In order to ensure the normal and safe production operation of the device, the leakage should be plugged under pressure without stopping.