Load holding valve with high sealing performance

The utility model discloses a high-leakproofness load holding valve which comprises a valve body, a valve pipe is fixedly arranged at the top end of the valve body, a sliding groove is formed in the inner surface of the middle of the top end of the valve pipe, a sliding block is arranged in the sliding groove in a sliding mode, a center shaft is fixedly arranged on the inner side of the sliding block, a threaded hole is formed in the center shaft, and the threaded hole is communicated with the valve pipe. The threaded hole is in threaded connection with a threaded column, a sealing block is fixedly arranged at the bottom end of the threaded column, four positioning blocks are fixedly arranged at the top end of the sealing block, and four positioning columns are fixedly arranged at the inner top of the valve pipe. According to the structure, the four positioning blocks are installed at the top end of the sealing block and matched with the positioning columns for use, the sealing block can be limited, the situa