In chemical plant, the valve using medium are mostly with inflammable, explosive, toxic and corrosive strong characteristics, and complex process, process conditions, long construction period, once the valve failure in production, light person leading to medium leakage, environmental pollution, the person that weigh cause fire and explosion, caused by malignant accident loss brings to the nation and the people's life safety, So chemical production of valve quality requirements are higher. Its main functions are: connect and truncate the medium; Prevent medium flow back; Adjust the medium pressure, flow; To prevent the medium pressure exceeding the specified value, to ensure the safe operation of the pipeline or equipment.
