【JST-105】One-on-one technical discussion on industrial valves
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Technical communicator: No limit, no husband. My professional expertise includes the research, development, design, manufacturing, quality control, and technical standards of industrial valves, as well as their application in actual operational environments. Online availability: Irregular, but I am online frequently. Work experience: 23 years in this field. Personal insight: Learning is an endless process; we should discuss things with each other to make progress together, and strive to help Chinese valves gain a foothold on the international stage! Contact: QQ31430-8686; in-depth technical discussions are welcome. Thank Haichuan for providing a platform for communication.
Hello, could using two pressure regulators of different specifications in parallel cause instability?
Different specifications refer to variations in the nominal diameter; for pressure regulators with smaller specifications, the flow rate will be higher, while the total flow volume remains unchanged. If it refers to different set pressure reduction parameters, the outlet pressure depends on the higher set pressure; the operational stability of the pressure reducing valve depends on the stability of the pressure difference before and after the valve. Based on this analysis, using pressure reducing valves of different specifications in parallel does not lead to instability.
I would like to ask some questions regarding oxygen pipelines; I appreciate it if you could provide answers despite your busy schedule. Please check the post at https://bbs.hcbbs.com/thread-2023901-1-1.html. Thank you
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For which types of media are the Q41H-16c and Q41F-16c valves suitable for use, such as water, steam, compressed air, etc.?
According to the HG/T20592 flange standard, for PN systems, there are two series of piping: A and B. For a given diameter, the outer diameter of the pipes varies (for example, for DN150, the outer diameters are 159 and 168 respectively), and the inner diameters of the pipes also differ accordingly； The question is, when purchasing valves, should it be specified whether the valve flanges are of series A or series B (corresponding to the PN system)?
Valve flanges are designed and manufactured according to the dimensions of integral steel pipe flanges, and do not involve AB series piping. Therefore, when purchasing valves, there is no need to specify AB size requirements. (For valve flange dimensions, see pages P50–P56 of HG/T 20592)
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