The industry involves: 

 Petroleum, petrochemical, refining chemical industry, ethylene, fine chemical industry, constant decompression, hydrogenation, coking, renormalization, sulfur recovery, etc. in the refining and chemical industry. 

 Application product type: 

 Medium/high pressure regulating valve; medium/high pressure cutting ball valve; axial flow multi-stage pressure-relief regulating valve; labyrinth-type multi-stage pressure-relief regulating valve; multi-layer sleeve multi-stage pressure-relief regulating valve; eccentric rotary regulating valve; gate valve; three eccentric butterfly valve, etc., plastic-lined regulating valve, plastic-lined cutting valve.