The complex connection of the system and the unreasonable arrangement of the pipe network gave rise to faults such as leak of residual cake valve and seriously impacted the normal operation of the plant.

The analysis on common problems of return cone valve and deslagging cone valve;

Study on leakage reasons of gate valve in ammonium phosphate solution;

Strength analysis and structural optimization of large-calibred gate valve body;

Spray welding techology for sealing surface of gate valve on gas production wellhead;