Most of the valves with the most maintenance value are concentrated under harsh working conditions, but valve reconstruction maintenance is still a new thing that is not well known in the industry, so quality has become the concern of many customers. Therefore. In Baicere, quality control mainly depends on the scientific construction and strict implementation of ISO9001: 2008 international quality system. Years of maintenance practice have proved that the quality control system of Baicere is very perfect and effective.