Abstract:The seal leakage problems of the cylinder pressure filler were analyzed during the testing process of a recycle hydrogen compressor of diesel hydrotreating unit. The design of cylinder pressure filler was improved from two aspects of seal material and filler packing seal structure of the system, such as improving filler material wear resistance and the spring strength, increasing the oil filling hole to ensure the lubrication uniform of filler, increasing of O type ring for the flange to prevent gas leakage from the packing box, and improving of water circulation to make a better cooling effect. The improved scheme has solved the filler leakage problem of high pressure packing seal, which provides reference methods to deal with similar issues for the domestic similar equipment.