Discussion on valve selection cases
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This post was last edited by Liushui Zhiyun shine on 2018-1-19 at 14:00. Teacher Song Keké is an expert in chemical process piping design with numerous publications; I own several of his books. On page P172 of the second edition of his book \"Design of Pressure Pipelines and Engineering Examples\", in Case Study 1 on valve selection, there are some points that are not clear; please help to clarify them.
This post was last edited by Clouds of flowing water shine on 2018-1-19 at 14:38. Questions: 1. The material information corresponding to the temperature and pressure curves in Table 4-75 is incomplete; for example, if the valve body is made of low-carbon or ultra-low-carbon stainless steel, there are no relevant parameters available. Which table should be referred to? Can I check the temperature and pressure curve for HG/T20592 flanges? 2. The case states that, at the same pressure level, gate valves are more expensive than medium valves – is this a common phenomenon? 3. In the \"Manual for the Installation Design of Process Piping in Petrochemical Plants, Fifth Edition, Part 3: Valves\" and its previous editions, there are multiple manufacturers of J41H-25. Since this model is not mentioned in the examples and gate valves are used instead, isn’t that unreasonable?
1. I think it can be found in the standards for valves used in the project, such as GB12224. 2. I am also skeptical about this claim, as other sources state that globe valves generally weigh more than gate valves of the same grade and diameter, which is why they are usually more expensive as well； 3. As I understand it, for this example, the book provides so many tables; therefore, the final conclusion is drawn based on the information available in the book. These are my thoughts; I look forward to the expert’s answer