Regarding the models of needle valves
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I would like to ask fellow sailors: what is the difference between needle valves J11 and J13? Both of them use internal threading for connection; the first type has a straight-through design. What does the number 3 in J13 represent? I saw in previous posts that some people said it represents a corner type, but according to valve naming conventions, 4 is the one that denotes a corner type; there is no such thing as 3 in the structural types of globe valves. What does this mean?
11 and 13 differ only in their flow channels from the straight-through type: the channel in 11 is basically straight, while that in 13 is Z-shaped; it is estimated that the latter has better adjustment performance.
Reply to 2# yuzhilicn: Thank you. So, they are all of the direct-type design, with only different flow channels, right?
The difference between needle valves J11 and J13: both use internal thread connections, and the number 3 in J13 indicates that the sealing surface is manufactured as part of the valve body
Reply to 4# zhouhf78: In the chemical engineering manuals and standards I’ve seen, the materials used for the valve seat sealing surfaces are indicated by letters; for example, in J13W, the letter W indicates that the valve seat sealing surface is machined directly from the valve body. Where did you get this idea?
http://bbs.hcbbs.com/thread-908977-1-1.html
Reply 5# candy36 http://bbs.hcbbs.com/thread-908977-1-1.html
Reply to 7# zhouhf78: Thank you for the link you provided. I think the answer given on the sixth floor of that post is correct. J: Stop valve; 1: Internal thread; 3: Flow channel in Z shape; W: The valve seat sealing surface is formed directly from the valve body (the material of the valve seat sealing surface is the same as that of the valve body; this code is commonly used for stainless steel valves); 160: Nominal pressure: PN16.0 Mpa; P: The valve body is made of stainless steel; since needle valves generally have forged valve bodies, the material should be F304.
:Victory: They are all direct-connection types; currently, needle valves J11 and J13 are the same type of valve, with only the spelling differing.
Well, I’m not quite sure. http://bbs.hcbbs.com/thread-751951-1-1.html J21W-320P external thread needle valve http://www.denbao.cn/zxf/357.html