Petrochemical industry refers to the production of petroleum products such as gasoline, kerosene, diesel, lubricating oil and liquefied petroleum gas with petroleum and natural gas as raw materials; the production of olefins and aromatics with light oil as raw materials to produce synthetic resins, synthetic fibers, synthetic rubber and various Modern industry of chemical raw materials and other products.
    In the petrochemical industry, there are oil refineries, ethylene plants, chemical fiber plants, chemical plants, fertilizer plants, etc. Now many large conglomerates have become integrated refineries and chemical plants.

   Valves: Petrochemical valves are the most common equipment in petrochemical production facilities. Various gas and liquid media in petrochemical production must pass through various valves and be blocked or transported to various containers and process equipment according to the needs of the production process. The valves commonly used in petrochemical production are divided into general valves and special valves. General petrochemical valves include gate valves, globe valves, ball valves, check valves, butterfly valves, pressure reducing valves, safety valves, regulating valves, etc.; petrochemical special valves include those in catalytic cracking units Sliding valve and high temperature butterfly valve, four-way switching valve and coke blocking valve in delayed coking unit, high temperature cracking flat gate valve and low temperature valve in ethylene cracking unit, solid valve in polyethylene and polypropylene unit, high temperature and high pressure in synthetic ammonia unit Angle type globe valve and throttle valve, etc.