I would like to ask about pipeline materials and general valve issues

1. Whether a wafer-type butterfly valve requires a special flange depends mainly on the operating conditions and design requirements. Under normal circumstances, a wafer butterfly valve can be installed directly between two flanges, without the need for special flanges. However, at high temperatures above 150°C, issues such as material expansion may require the use of specific flanges to ensure sealing and heat resistance. 2. The main structural differences between the high-temperature vacuum ball valve at 200℃ and the ordinary high-temperature ball valve Q41W-16P lie in the material selection and design of the valve seat and sealing surfaces, in order to meet different operating conditions. For example, in a vacuum environment where higher sealing performance is required, special materials or designs may be used to ensure proper sealing. The design of the valve stem and the sealing surface may also vary to ensure the stability and sealing performance of the valve under high temperatures or specific operating conditions. 3. Regarding the severity of the valve inspection standards GB/T26480, GB/T13927, and JB/T9092, these three standards are applicable to the inspection of valves under different types and operating conditions. GB/T26480 and GB/T13927 are primarily used for the inspection of valves in industrial pipelines, whereas JB/T9092 is more specifically aimed at the inspection and testing during the valve manufacturing process. Generally speaking, it is not absolute which specific standard is stricter; the decision must be made based on the specific application scenario of the valve as well as the requirements of that standard. Typically, when designing and using valves, the requirements of multiple standards are taken into account to ensure the valves’ performance and safety. .

Thank you so much~ I understood the first point. For the second point, could you please advise on what specific materials can be used? The medium is air (containing a small amount of ethylene glycol vapor). The valve body and actuator should be made of CF8, while the valve seat sealing surfaces should be made of F316L/STL. The valve disc sealing surfaces also need to be made of F316L/STL. The valve stem should be made of 06Cr18Ni11Ti/STL. Can this setup be used in a vacuum environment? Thirdly, may I ask where I can find the corresponding book or standards? Thank you!

Regarding the second question, the materials you mentioned – CF8 (equivalent to 304 stainless steel), F316L (a more corrosion-resistant version of 316 stainless steel), 06Cr18Ni11Ti (321 stainless steel with better high-temperature resistance), and STL (a surfacing alloy) – are all materials suitable for high-temperature environments and possess good corrosion resistance. These materials can be used in vacuum conditions, but it is important to ensure that the overall design and manufacturing process of the valves guarantee good sealing performance under vacuum. The sealing design of valves may need to be optimized for vacuum environments, such as by using special seal material and fastening methods. Regarding the third question, standards such as GB/T26480, GB/T13927, and JB/T9092 can be found on the website of the Standardization Administration of China or on professional websites that sell standard books. Generally, you can search for these standard numbers to find relevant books or electronic standard documents. Sometimes, relevant information on these standards can also be obtained from engineering design firms or valve manufacturers. If you work in the valve industry, your company may have purchased the relevant standard documents or standard books for reference. .