Is there a standard number for the table of structural dimensions for valves (national standard)?
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I would like to ask: does the so-called list of structural dimensions for valves (national standard) have a **standard number? How is it that no evidence can be found?
GBT 27734-2011 Polypropylene (PP) valves for pressure pipelines – Basic dimensions – Metric series; JBT 2768-2010 Valve components – Dimensions of high-pressure pipes, fittings, and valve ends
Thank you, neither of these is what I’m looking for.
The general national standard is GB/T12221, while the American standard is ASME B16.10
There are some compact forged steel valves that can refer to JB/T7746; among American-standard valves, those with special pressure ratings refer to ASME16.34
I’m familiar with GBT12221, but when I went to the construction site, I found that the structural length of some ball valves that needed to be replaced was different from that specified in 12221; it matched the values listed in this so-called “Table of Valve Structural Dimensions (National Standard)”. I just want to know where this table comes from.
Thank you; the origin of this table is not here, and I’m aware of what you’re referring to.
Could the ball valve you mentioned be of the reduced-bore type? If so, its structural length will be based on that of the previous specification
The dimensions of national standard valves are based on GB/T 12221.