Various types of valves commonly used occasions

Gate valve: Used in applications where a straight flow of fluid and minimum restriction is desired. Ball valve: Suitable for applications where quick shut-off is required. Butterfly valve: Ideal for applications where space is limited and a quick operation is needed. Check valve: Used to prevent backflow in a piping system. Pressure relief valve: Installed to protect equipment from overpressure situations.

Valves for city gas: city gas accounts for 22% of the entire natural gas market, with a large number and variety of valves. Need the main ball valves, plug valves, pressure reducing valves and safety valves.

Valves for city heating: in the city thermal power generation system, a large number of metal-sealed butterfly valves, horizontal balance valves and direct buried ball valves are needed, because these valves can solve the problem of longitudinal and horizontal hydraulic imbalance of pipelines, and achieve the purpose of energy-saving and thermal balance of power generation.

3. Valves for urban construction: low-pressure valves are commonly used in urban construction systems, to the direction of environmental protection and energy saving. Environmentally friendly rubber plate valves, balance valves, centerline butterfly valves, metal-sealed butterfly valves are gradually replacing low-pressure iron gate valves. Most of the valves required for domestic construction are balance valves, soft seal gate valves, butterfly valves and so on.

Environmental protection valves: in the domestic environmental protection system, the water supply system mainly needs centerline butterfly valve, soft seal gate valve, ball valves and exhaust valves (used to discharge the air in the pipeline). Sewage treatment system mainly need soft seal gate valve and butterfly valve.

Long-distance pipeline valves: long-distance pipeline is mainly crude oil, finished products and natural pipelines. The most used valves in such pipelines are forged steel three-body full bore ball valves, sulfur-resistant flat gate valve, safety valves and check valves.

6. 石化厂阀门：a. 炼油设备，大多数所需的阀门是管道阀门，主要包括闸阀、截止阀、止回阀、安全阀、球阀、蝶阀、陷阱等，其中对闸阀的需求约占阀门总数的80%（阀门占设备总投资的3%~5%）。b. 化纤设备，化纤产品主要包括涤纶、丙烯酸和维纶。所需阀门包括球阀和夹套阀（夹套球阀、夹套闸阀和夹套截止阀）。c. 丙烯清洁装置。工厂通常需要符合API标准的阀门，主要包括闸阀、截止阀、止回阀、球阀、陷阱、针阀和插阀，其中闸阀约占阀门总数的75%。d. 合成氨装置。由于合成氨原料和净化方法不同，所需阀门的工艺性能也不同。目前，国内合成氨厂主要需要闸阀、截止阀、止回阀、陷阱、蝶阀、球阀、隔膜阀、调节阀、针阀、安全阀和高低温阀。其中，截止阀占工厂阀门总数的53.4%，闸阀占25.1%，陷阱占7.7%，安全阀占2.4%，调节阀、低温阀等占11.4%。乙烯装置是石化行业的主要设备，需要各种阀门。闸阀、截止阀、止回阀和升降杆球阀占大部分，其中闸阀应该是首选。在“十五”期间，全国仍需建设六座年产66万吨的乙烯装置，阀门需求量相当大。此外，大型乙烯和高压聚乙烯装置还需要超高温、超低温和超高压阀门系列产品。f. 空分装置。“空分”意味着空气分离。该装置主要需要截止阀、安全阀、止回阀、调节阀、球阀、蝶阀和低温阀。g. 聚丙烯装置，聚丙烯是由丙烯聚合而成的聚合物化合物。该装置主要需要闸阀、截止阀、止回阀、针阀、球阀和陷阱。7. 电站阀门：中国的电厂建设正朝着大型化发展，因此需要使用大口径、高压安全阀、减压阀、截止阀、闸阀、蝶阀、紧急切断阀、流量控制阀、球形密封仪表切断阀（根据国家“十五”计划，除内蒙古外，全国首次使用“十五”计划。根据国家“十五”计划，除内蒙古、贵州省外，其他省市只能建设30万千瓦以上的机组）。

Valves for metallurgy: wear-resistant slurry valves (inflow cut-off valve) and regulating traps are the main needs of the metallurgical industry in the behavior of alumina. Steelmaking industry mainly needs metal-sealed ball valves, butterfly valves and oxidation ball valves, globe valves and four-way directional valves.

Marine valves: with the development of offshore oil field development, the number of valves required for marine oil development is gradually increasing. Offshore platforms require shut-off ball valves, check valves and multi-way valves.

Food, pharmaceutical valves: the industry mainly needs stainless steel ball valves, non-toxic all-plastic ball valves, butterfly valves. Among the above 10 valve products, the demand for general-purpose valves is the highest, such as instrument valves, needle valves, gate valves, globe valves, check valves, ball valves, butterfly valves and so on.