Valve size specifications
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I’m looking for specifications regarding valve sizes; for example, there are standards for the standard dimensions of ball valves, globe valves, and safety valves with DN50/80 ratings, and such specifications can be found in relevant manuals
Ball valve **standard**: GBT 12237-2007 Steel ball valves for use in the petroleum, petrochemical, and related industries. Safety valve standard: JBT 2203-1999 Spring-loaded safety valves – Structural length. Gate valve standards: GB12235-2007 Gate valves and check valves. For specific dimensions, please refer to the samples provided by the manufacturer.
The face center distance and dimensions of safety valves are now both in accordance with API 526 standards
There are many possible structural lengths for valves, and it mainly depends on which standards and specifications are used for definition
\"Practical Questions and Answers on Valve Technology\", \"Guide to the Selection of Industrial Valves\", \"Manual for the Installation and Design of Process Piping in Petrochemical Plants, Fifth Edition, Part 3: Valves\"
For standard specifications, the external dimensions are usually available, but GB standards offer many different size options (referring to the same valve class and pipe diameter), so special care is required. For example, according to the national standards GB12237 and GB12221, valve lengths come in long, medium, and short varieties. There are pitfalls!
Each company has its own molds; it’s sufficient to inspect them according to the drawings.