Valve coding method,
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The descriptions of valves in the pipe grade tables prepared by many design institutes vary; this mainly applies to the valve TRIM specification, which is indicated as STL/13Cr/13Cr, STL-13Cr, STL-13Cr, 13Cr-13Cr. May I ask the experts how to prepare valve documents, using the description below as an example. For example, (A105, 13Cr/STL internal components, RF CL300 wedge-shaped single gate valve, BB, OS&Y, operated by handwheel. ) For Z41H-300C, if 13Cr/STL is changed to STL/13Cr/13Cr, STL-13Cr, STL-13Cr, 13Cr-13Cr, what should be the new names? Thank you to all the experts.
Standard American valves do not have a specific system for assigning model numbers; “Z41H-300C” is actually an irregular designation, as it applies the numbering system used for standard Chinese valves to American-standard valves. According to the API 600 lining table, STL/13Cr/13Cr is lining type 8, STL-13Cr is lining type 5, and 13Cr-13Cr is lining type 1. If national standard sleeves must be used, 13Cr-13Cr corresponds to Z41W-300C, and STL-13Cr corresponds to Z41Y-300C.
So if it is written as “13Cr/STL”, is it Y or H?
It should be Y; the standard model designation sets of 13CR/13CR/STL and 13CR/STL don’t seem to work well
The American standard designates the material of each sealing surface, while the Chinese standard uses materials with lower hardness or corrosion resistance to denote the sealing surfaces; therefore, a seal made of 13Cr/STL should be classified under the 13Cr category, with H being the corresponding code. STL/STL is classified as Y； The pressure rating code requires the addition of CL in front of the number; some manufacturers are accustomed to adding Lb after the number, and entering just the number may lead to it being mistaken for the nominal pressure (in bars)
Is the 316 material H or Y?
It depends on what the material of your valve body is; if it’s also 316, then it’s W, otherwise it’s H.