Applications for globe valves: Part 6

11. API 602 forged steel globe valve: This kind of globe valve is designed according to the American Petroleum Institute standard API 602, the valve body and bonnet are forged of carbon steel or stainless steel, the valve body and the bonnet are connected with bolted connections, threaded connections and welding, there are upper thread stem and lower thread stem, the sealing material is Cr13 steel, stainless acid-resistant steel to STL cemented carbide, the packing is flexible graphite or PTFE, the connection method is flange, thread, socket welding and butt welding, and the pressure level is CL800 ~ CL1500, nominal size NPS 1/4" ~ NPS 2-1/2". Widely used in petrochemical, electric power, chemical and other departments of the equipment and pipeline, the working medium is steam, oil, corrosive medium. The structure length is according to ASME B16.10, the flange connection size is according to ASME B16.5, the welding end size is in accordance with ASME B16.25, the socket welding hole size is in accordance with ASME B16.11, and the threaded connection end size is in accordance with ASME B1.20.1.

12. Plunger globe valve: This type of plunger valve is a radial seal, which is realized by two elastic sealing rings sleeved on the polished plunger. The two elastic sealing rings are separated by a collar, and the elastic sealing ring around the plunger is pressed firmly by the load applied to the valve cover by the connecting bolts of the valve body and the bonnet to ensure the seal. The material combination of the valve is carbon steel for the shell, Cr13 stainless steel for the plunger, flexible graphite for sealing ring, which can be used for water, steam and oil pipelines; If the shell is made of stainless acid-resistant steel, the plunger is made of stainless acid-resistant steel, and the sealing ring is made of polytetrafluoroethylene, it is suitable for acid and alkali corrosive media. The advantages of this valve are reliable sealing, relatively long life and easy maintenance; The disadvantage is the slow opening and closing speed. This type of valve is widely used in urban construction systems, water and steam pipelines in urban heating.

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