Valve is an indispensable control device in the equipment of petrochemical production. There are many types of valves. With the continuous improvement of the process of various types of equipment, the types of valves are constantly increasing.

It is understood that the valves for petrochemical industry can be divided into the following categories according to their uses:
1. Gate valves, globe valves, plug valves, ball valves and butterfly valves used to cut off or connect the medium in the pipeline;
2. Regulating valves (both pneumatic and electric) for regulating the pressure and flow of medium in the pipeline, pressure reducing valves, throttle valves, butterfly valves, balancing valves, etc .;
3. A check valve used to prevent the medium from flowing backward and to ensure the unidirectional flow of the medium;
4. It is used for safety protection of over-temperature and over-pressure, to discharge excess medium, to prevent temperature and pressure from exceeding the specified values, so as to ensure the safe operation of equipment and piping systems, safety valves, etc .;
5. Distributing valve, three-way or four-way plug valve, three-way or four-way ball valve used to change the direction of medium flow in the pipeline;
6. Sampling valve for sampling and analysis of medium;
7. Other special purpose traps, blowdown valves, vent valves, slag discharge valves, etc.

Experts predict that during the "Twelfth Five-Year Plan" period, the development of petrochemical valves will focus on the development of new valves for major petrochemical, oil and gas gathering and transportation pipelines, coal liquefaction and other major engineering constructions, such as cracking ethylene plants of 800,000 tons and above. The demand for high-temperature valves, large-diameter high-pressure ball valves, large-diameter oil pipeline ball valves, and low-temperature valves for liquefied natural gas will increase greatly.

In recent years, the localization of China''s petrochemical valves has continued to increase, occupying a place in the high-end market. China Nuclear Su Valve and Lanzhou High Pressure Valve have become the main domestic suppliers of special valves for domestic large-scale ethylene complete sets of special equipment. Among them, the coke-clearing flat gate valve of the hydrogenation unit valve independently developed by China Nuclear Su Valve Co., Ltd. has been successfully applied to the domestic engineering of Dongfang Chemical Plant. China Nuclear Su Valve only supplies nearly 100 million yuan of special valves in this field, making a major breakthrough in the localization of special valves for large-scale ethylene plants. In addition, Zhejiang Huadong Valve successfully developed the first new products such as hydrogenation valve and ethylene valve in China; "CO2 stripping urea special high pressure regulating butterfly valve" developed by Sijie Chemical; high temperature ball valve developed by Kates; Chuanli smart valve The industry''s encrypted anti-theft front valve rewrites the history of domestic hydrogenation valve dependence on imports.

However, experts have said that in the petrochemical industry, such as high-pressure bellows valves in high-pressure polyethylene, coke-clearing flat valves for ethylene cracking furnaces, and key valves with ultra-high temperature, high pressure or ultra-low temperature for ethylene over 2500 pounds, some special materials valves are still required Including a variety of structure trouser valve, sleeve valve, jacket valve, control system control valve all rely on imports.

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